A particle of mass $m$ strikes elastically on a wall with velocity $v$, at an angle of $60^{\circ}$ from the wall then magnitude of change in momentum of ball along the wall is

The quantity that is not conserved in an inelastic collision is

A ball of $0.4\,kg$ mass and a speed of $3\, m/s$ has a head-on, completely elastic  collision with a $0.6-kg$ mass initially at rest. Find the speeds of both balls after the  collision:

An object of mass $M$ is at rest on smooth horizontal surface. Objects of different masses collide head on elastically to the object of mass $M$ . All colliding objects are having fixed same kinetic energy and in each case mass $M$ is supposed to be at rest initially. In this experiment the kinetic energy transferred to stationary mass $(M)$ depend on linear momentum of incoming colliding mass then energy transferred to $M$ in a collision is

A body of mass $2\,kg$ makes an elastic collision with another body at rest and continues to move in the original direction with one fourth of its original speed. The mass of the second body which collides with the first body is .......... $kg$

A smooth rightangled wedge of mass $M$ is kept on a smooth horizontal surface as shown. A mass $m$ is released from top of wedge when $m$ reaches ground its speed is $V$. Work done by normal contact force on $m$, while it comes down to ground is :-