The position-time graph of a particle is a semicircle with radius $R$. The average velocity of the particle over the entire journey is:

The motion of a body falling from rest in a resistive medium is described by the equation $\frac{{dv}}{{dt}} = a - bv,$ where a and b are constants. The velocity at any time t is

A ball P is dropped vertically and another ball Q is thrown horizontally with the same velocities from the same height and at the same time. If air resistance is neglected, then

A body A is thrown up vertically from the ground with a velocity ${V_0}$ and another body B is simultaneously dropped from a height H. They meet at a height H/2 if ${V_0}$ is equal to

A bullet is fired with a speed of 1000 m/sec in order to hit a target 100 m away. If $g = 10\;m/{s^2}$, the gun should be aimed

Velocity – time graph of a body thrown vertically up is

When a ball is thrown up vertically with velocity ${v_0}$ , it reaches a maximum height of 'h'. If one wishes to triple the maximum height then the ball should be thrown with velocity

A ball is released from the top of a tower of height h metre. It takesT sec to reach the ground. What is the position of the ball in $\frac{T}{3}{\rm{s}}?$

A straight line on a velocity-time graph represents:

A ball is thrown vertically upwards. Which of the following graphs best represents the variation of its kinetic energy with height?

A ball is thrown vertically upwards from the surface of earth with a speed of 18${\rm{km}}{{\rm{h}}^{ - 1}}$. If ${\rm{g}} = 10{\rm{m}}{{\rm{s}}^{ - 2}}$, then the maximum height attained by the ball is