A stone is dropped into water from a bridge 44.1 m above the water. Another stone is thrown vertically downward 1 sec later. Both strike the water simultaneously. What was the initial speed of the second stone?
12.25 m/s
14.75 m/s
16.23 m/s
17.15 m/s
A body is thrown vertically upwards. If air resistance is to be taken into account, then the time during which the body rises is
Equal to the time of fall
Less than the time of fall
Greater than the time of fall
Twice the time of fall
A body is released from a great height and falls freely towards the earth. Another body is released from the same height exactly one second later. The separation between the two bodies, two seconds after the release of the second body is
4.9 m
9.8 m
19.6 m
24.5 m
An object is projected upwards with a velocity of 100 m/s. It will strike the ground after (approximately)
10 sec
20 sec
15 sec
5 sec
A stone dropped from the top of the tower touches the ground in 4 sec. The height of the tower is about
80 m
40 m
20 m
160 m
A body is released from the top of a tower of height h. It takes t sec to reach the ground. Where will be the ball after time t/2 sec
At h/2 from the ground
At h/4 from the ground
Depends upon mass and volume of the body
At 3h/4 from the ground
A particle is projected up with an initial velocity of 80ft/sec. The ball will be at a height of 96ft from the ground after (Given g= 32 ft/s2 )
2.0 and 3.0 sec
Only at 3.0 sec
Only at 2.0 sec
After 1 and 2 sec
A body falls from rest, its velocity at the end of first second is (g=32ft/sec2)
16 ft/sec
32 ft/sec
64 ft/sec
24 ft/sec
A stone thrown upward with a speed u from the top of the tower reaches the ground with a velocity 3u. The height of the tower is
3u2/g
4u2/g
6u2/g
9u2/g
Two stones of different masses are dropped simultaneously from the top of a building
Smaller stone hit the ground earlier
Larger stone hit the ground earlier
Both stones reach the ground simultaneously
Which of the stones reach the ground earlier depends on the composition of the stone
A body was thrown up with an initial speed of 96 ft/sec reaches the ground after: (g=32ft/sec2)
3 sec
6 sec
12 sec
8 sec
A stone is dropped from a certain height which can reach the ground in 5 second. If the stone is stopped after 3 second of its fall and then allowed to fall again, then the time taken by the stone to reach the ground for the remaining distance is
2 sec
4 sec
None of these
A man in a balloon rising vertically with an acceleration of 4.9 m/sec2 releases a ball 2 sec after the balloon is let go from the ground. The greatest height above the ground reached by the ball is (g=9.8 m/sec2)
14.7 m
A particle is dropped under gravity from rest from a height h(g=9.8 m/sec2) and it travels a distance 9h/25 in the last second, the height h is
100 m
122.5 m
145 m
167.5 m
A balloon is at a height of 81 m and is ascending upwards with a velocity of 12 m/s. A body of 2 kg weight is dropped from it. If g=10 m/s2, the body will reach the surface of the earth in
(1) 5 s
(2) 4.025 s
(3) 5.4 s
(4) 6.75 s
Water drops fall at regular intervals from a tap which is 5 m above the ground. The third drop is leaving the tap at the instant the first drop touches the ground. How far above the ground is the second drop at that instant
2.50 m
3.75 m
4.00 m
1.25 m
A ball is thrown vertically upwards from the top of a tower at 4.9 ms−1. It strikes the pond near the base of the tower after 3 seconds. The height of the tower is:
73.5 m
44.1 m
29.4 m
A rocket is fired upward from the earth's surface such that it creates an acceleration of 19.6 m/sec2. If after 5 sec its engine is switched off, the maximum height of the rocket from earth's surface would be [MP PET 1995]
245 m
490 m
980 m
735 m
A body starts to fall freely under gravity. The distances covered by it in first, second and third second will be in the ratio
1 : 3 : 5
1 : 2 : 3
1 : 4 : 9
1 : 5 : 6
P, Q and R are three balloons ascending with velocities U, 4U and 8U respectively. If stones of the same mass be dropped from each, when they are at the same height, then
They reach the ground at the same time
Stone from P reaches the ground first
Stone from R reaches the ground first
Stone from Q reaches the ground first
A body is projected up with a speed ‘u’ and the time taken by it is T to reach the maximum height H. Pick out the correct statement.
It reaches H/2 in T/2 sec
It acquires velocity u/2 in T/2
Its velocity is u/2 at H/2
Same velocity at 2T
A body falling for 2 seconds covers a distance S equal to that covered in next second. Taking g=10 m/s2, S=
30 m
10 m
60 m
A body dropped from a height h with an initial speed of zero, strikes the ground with a velocity 3 km/h. Another body of the same mass is dropped from the same height h with an initial speed −u'=4km/h. Find the final velocity of the second body with which it strikes the ground.
3 km/h
4 km/h
5 km/h
12 km/h
A ball of mass m1 and another ball of mass m2 are dropped from equal height. If time taken by the balls are t1 and t2 respectively, then
t1=t22
t1=t2
t1=4t2
t1=t24
With what velocity a ball be projected vertically so that the distance covered by it in 5th second is twice the distance it covers in its 6th second (g=10 m/s2)
58.8 m/s
49 m/s
65 m/s
19.6 m/s
A ball is dropped downwards. After 1 second another ball is dropped downwards from the same point. What is the distance between them after 3 seconds
25 m
A stone is thrown with an initial speed of 4.9 m/s from a bridge in vertically upward direction. It falls down in water after 2 sec. The height of the bridge is
19.8 m
24.7 m
A stone is shot straight upward with a speed of 20 m/sec from a tower 200 m high. The speed with which it strikes the ground is approximately
60 m/sec
65 m/sec
70 m/sec
75 m/sec
A body freely falling from the rest has a velocity ‘v’ after it falls through a height ‘h’. The distance it has to fall down for its velocity to become double, is
2 h
4 h
6 h
8 h
Velocity of a body on reaching the point from which it was projected upwards, is
v=0
v=2u
v=0.5u
v=-u
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