A body of mass $4\ kg$ collides head-on elastically with another body of mass $2\ kg$ kept at rest in free space. Time of collision is $0.02\ sec$ and average impulse force acted on each bodies is $100\ N$. Find the velocity of the $2\ kg$ body after the impact
$0$
$1$
$2$
$3$
An inelastic ball is dropped from a height of $100\, m$. Due to earth$20\%$ of its energy is lost. To what height the ball will rise ......... $m$
A bullet of mass $0.01\, kg$ and travelling at a speed of $500 \,m/s$. strikes a block of mass $2 \,kg$. which is suspended by a string of length $5\,m$. The centre of gravity of the block is found to raise a vertical distance of $0.1\,m$. What is the speed of the bullet after it emerges from the block- ................ $\mathrm{m}/ \mathrm{s}$
Which one of the following statements does not hold good when two balls of masses $m _1$ and $m _2$ undergo elastic collision
A truck moving on horizontal road towards east with velocity $20\, ms^{-1}$ collides elastically with a light ball moving with velocity $25\, ms^{-1}$ along west. The velocity of the ball just after collision
A ball strikes against the floor and returns with double the velocity; in which type of collision is it possible?