The time in which a force of $2 \,N$ produces a change of momentum of $0.4\,kg - m{s^{ - 1}}$ in the body is ......... $\sec$

Explain -product of mass and velocity is important in producing effect of force.

When a horse pulls a wagon, the force that causes the horse to move forward is the force

A ball of mass m falls vertically to the ground from a height$ h_1$ and rebound to a height ${h_2}$. The change in momentum of the ball on striking the ground is

An object starts from rest and is acted upon by a variable force $F$ as shown in figure. If $F_0$ is the initial value of the force, then the position of the object, where it again comes to rest will be

A particle of mass $m$ moving with velocity $u$ makes an elastic one dimensional collision with a stationary particle of mass $m$. They are in contact for a very short time $T$. Their force of interaction increases from zero to $F_0$ linearly in time $T/2$, and decreases linearly to zero in further time $T/2$. The magnitude of $F_0$ is