A body of mass $5 \,kg$ is moving with velocity of $\vec{v}=(2 i+6 \hat{j}) \,m / s$ at $t=0 \,s$. After time $t =2 \,s$, velocity of body is $(10 \hat{i}+6 \hat{j})$, then change in momentum of body is ......... $kg m / s$

A body of mass $m$ is projected at an angle of ${45^o}$ with the horizontal. If air resistance is negligible, then total change in momentum when it strikes the ground is

The distance covered by a body of mass $5\,g$ having linear momentum $0.3\,kg\,m / s$ in $5\,s$ is $..........\,m$

A body moves with velocity $v = ln x\ m/s$ where $x$ is its position. The net force acting on body is zero at

A $40\ g$ ball dropped from a certain height bounces back from the horizontal ground without losing mechanical energy. If its speed is $10\ m/s$ just before making contact with the ground, and the average value of the force of the ground on the ball is equal to $16\ N$ while ball and wall are in contact, how long were they in contact .......... $m/s$