Explanation
A body has no relative motion with respect to itself. Hence if a frame of reference of the body is fixed, then the body will be always at relative rest in this frame of reference.
The displacement is the shortest distance between initial and final position. When final position of a body coincides with its initial position, displacement is zero, but the distance travelled is not zero.
Equation of motion can be applied if the acceleration is in opposite direction to that of velocity and uniform motion mean the acceleration is zero.
As velocity is a vector quantity, its value changes with change in direction. Therefore when a bus takes a turn from north to east its velocity will also change.
When two bodies are moving in opposite direction, relative velocity between them is equal to sum of the velocity of bodies. but if the bodies are moving in same direction their relative velocity is equal to difference in velocity of the bodies.
According to definition, displacement = velocity x time. Since displacement is a vector quantity so its value is equal to the vector sum of the area under velocity-time graph.
In uniform motion the object moves with uniform velocity, the magnitude of its velocity at different instant i.e., at t = 0, t = I sec, t = 2 sec, will always he constant. Thus velocity-time graph for an object in uniform motion along a straight path is a straight line parallel to time axis.
The uniform motion of a body means that the body is moving with constant velocity, but if the direction of motion is changing (such as in uniform circular motion), its velocity changes and thus acceleration is produced in uniform motion.
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