A body projected vertically upwards with a velocity u returns to the starting point in 4 seconds. If g = 10m/sec2, the value of u is
5 m/sec
10 m/sec
15 m/sec
20 m/sec
Time taken by an object falling from rest to cover the height of h1 and h2 is respectively t1 and t2 . Then the ratio of t1 to t2 is
h1 : h2
h1 : 2h2
2h1 : h2
A body is thrown vertically up from the ground. It reaches a maximum height of 100 m in 5 seconds. After what time will it reach the ground from the position of maximum height?
1.2 sec
5 sec
10 sec
25 sec
A body thrown vertically upwards with an initial velocity u reaches maximum height in 6 seconds. The ratio of the distances travelled by the body in the first second and the seventh second is
1 : 1
11 : 1
1 : 2
1 : 11
A particle is thrown vertically upwards. If its velocity at half of the maximum height is 10 m/s, then maximum height attained by it is (Take g = 10 m/s2)
8 m
10 m
12 m
16 m
A body, thrown upwards with some velocity, reaches the maximum height of 20m. Another body with double the mass thrown up, with double initial velocity will reach a maximum height of
200 m
80 m
40 m
A balloon starts rising from the ground with an acceleration of 1.25 m/s2 . After 8s, a stone is released from the balloon. The stone will (g = 10 m/s2)
Reach the ground in 4 second
Begin to move down after being released
Have a displacement of 50 m
Cover a distance of 40 m in reaching the ground
A body is thrown vertically upwards with a velocity u. Find the true statement from the following:
Both velocity and acceleration are zero at its highest point
Velocity is maximum and acceleration is zero at the highest point
Velocity is maximum and acceleration is g downwards at its highest point
Velocity is zero at the highest point and maximum height reached is u2/2g
A man throws a ball vertically upward and it rises through 20 m and returns to his hands. What was the initial velocity (u) of the ball and for how much time (T) it remained in the air [g=10m/s2]
u = 10 m/s, T = 2s
u = 10 m/s, T = 4s
u = 20 m/s, T = 2s
u = 20 m/s, T = 4s
A particle when thrown moves such that it passes from the same height at 2 sec and 10 sec, the height is:
g
2g
5g
10g
From the top of a tower, a particle is thrown vertically downwards with a velocity of 10 m/s. The ratio of the distances, covered by it in the 3rd and 2nd seconds of the motion is (Take g=10m/s2)
5 : 7
7 : 5
3 : 6
6 : 3
Two balls A and B of same masses are thrown from the top of the building. A, thrown upward with velocity v and B, thrown downward with velocity v, then
Velocity of A is more than B at the ground
Velocity of B is more than A at the ground
Both A & B strike the ground with same velocity
None of these
A cricket ball is thrown up with a speed of 19.6 ms–1. The maximum height it can reach is:
9.8 m
19.6 m
29.4 m
39.2 m
A very large number of balls are thrown vertically upwards in quick succession in such a way that the next ball is thrown when the previous one is at the maximum height. If the maximum height is 5m, the number of ball thrown per minute is (take g=10 ms−2)
120
80
60
40
A body falling from a high Minaret travels 40 meters in the last 2 seconds of its fall to ground. Height of Minaret in meters is (take g=10 ms−2)
45
50
A body falls from a height h=200m (at New Delhi). The ratio of distance travelled in each 2 sec during t = 0 to t = 6 second of the journey is
1 : 4 : 9
1 : 2 : 4
1 : 3 : 5
1 : 2 : 3
A man drops a ball downside from the roof of a tower of height 400 meters. At the same time another ball is thrown upside with a velocity 50 meter/sec. from the surface of the tower, then they will meet at which height from the surface of the tower
100 meters
320 meters
80 meters
240 meters
Two balls are dropped from heights h and 2h respectively from the earth surface. The ratio of time of these balls to reach the earth is
1:2
2 : 1
1 : 4
The acceleration due to gravity on the planet A is 9 times the acceleration due to gravity on planet B. A man jumps to a height of 2m on the surface of A. What is the height of jump by the same person on the planet B
18m
6m
23m
29m
A body falls from rest in the gravitational field of the earth. The distance travelled in the fifth second of its motion is (g=10m/s2)
25m
45m
90m
125m
If a body is thrown up with the velocity of 15 m/s, then the maximum height attained by the body is: (assume g = 10 m/s2)
11.25 m
16.2 m
24.5 m
7.62 m
A balloon is rising vertically up with a velocity of 29 ms–1. A stone is dropped from it and it reaches the ground in 10 seconds. The height of the balloon when the stone was dropped from it is (g = 9.8 ms–2)
100 m
400 m
150 m
A ball is released from the top of a tower of height h meters. It takes T seconds to reach the ground. What is the position of the ball in T/3 seconds?
h/9 meters from the ground
7h/9 meters from the ground
8h/9 meters from the ground
17h/18 meters from the ground
Two balls of same size but the density of one is greater than that of the other are dropped from the same height, then which ball will reach the earth first (air resistance is negligible)
Heavy ball
Light ball
Both simultaneously
Will depend upon the density of the balls
A packet is dropped from a balloon which is going upwards with the velocity 12 m/s, the velocity of the packet after 2 seconds will be
–12 m/s
12 m/s
–7.6 m/s
7.6 m/s
If a freely falling body travels in the last second a distance equal to the distance travelled by it in the first three seconds, the time of the travel is:
6 sec
4. 3 sec
3. 4 sec
The effective acceleration of a body, when thrown upwards with acceleration a will be:
a−g2
a2+g2
(a−g)
(a+g)
A body is thrown vertically upwards with velocity u. The distance travelled by it in the fifth and the sixth seconds are equal. The velocity u is given by (g = 9.8 m/s2)
24.5 m/s
49.0 m/s
73.5 m/s
98.0 m/s
A parachutist after bailing out falls 50 m without friction. When parachute opens, it decelerates at 2 m/s2. He reaches the ground with a speed of 3 m/s. At what height, did he bail out ?
293 m
111 m
91 m
182 m
When a ball is thrown up vertically with velocity v0, it reaches a maximum height of 'h'. If one wishes to triple the maximum height then the ball should be thrown with velocity
3vo
3v0
9v0
(3/2)v0
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