An object of $m\, kg$ with speed of $v\, m/s$ strikes a wall at an angle $\theta$ and rebounds at the same speed and same angle. The magnitude of the change in momentum of the object will be

A machine gun fires a bullet of mass $40\, g$ with a velocity $1200\, ms^{-1}$. The man  holding it, can exert maximum force of $144\, N$ on the gun. How many bullets can he  fire per second at the most ?

Displacement of a particle of mass $2\, kg$ moving in a straight line varies with time as $s  = (2t^3 + 2)\, m$. Impulse of the force acting on the particle over a time interval between $t = 0$ and $t = 1\, s$ is .......... $N-s$

On a stationary sail-boat, air is blown at the sails from a fan attached to the boat. The boat will

A body is projected at an angle of $30^{\circ}$ with the horizontal with momentum $p$. At its highest point, the magnitude of the momentum is

This question has Statement $1$ and Statement $2$. Of the four choices given after the Statements, choose the one that best describes the two Statements.

Statement $1$: If you push on a cart being pulled by a horse so that it does not move, the cart pushes you back with an equal and opposite force.

Statemf'nt $2$: The cart does not move because the force described in statement $1$ cancel each other