An object is thrown vertically upwards. At its maximum height, which of the following quantity becomes zero?
Momentum
Potential energy
Acceleration
Force
A ball of mass $m$ moving with velocity $v_0$ collides a wall as shown in figure. After impact it rebounds with a velocity $\frac {3}{4}v_0$. The impulse acting on ball during impact is
A particle of mass $2\, kg$ is initially at rest. A force acts on it whose magnitude changes with time. The force time graph is shown below. The velocity of the particle after $10\, s$ is ......... $ms^{-1}$
$A$ system of $N$ particles is free from any external forces. Which of the following must be true for the sum of the magnitudes of the momenta of the individual particles in the system?
Swimming is possible on account of