A $10 \mathrm{g}$ bullet is fired from a $1 \mathrm{kg}$. gun suspended to move freely. The bullet now enters a block of wood of mass $990 \mathrm{g}$. If the speed of the bullet is $500 {\mathrm{ms}}^{-1}$, find the speed of the recoil of the gun and the velocity imparted to the block.

A body of mass $1 \mathrm{kg}$ is suspended from a spring balance graduated at $g=10 \mathrm{m}/{\mathrm{s}}^2$. What would the spring balance read when the balance

moves up with an acceleration $5 \mathrm{m}/{\mathrm{s}}^2$. $\left(g=10 \mathrm{m}/{\mathrm{s}}^2\right)$

A body of mass $1 \mathrm{kg}$ is suspended from a spring balance graduated at $g=10 \mathrm{m}/{\mathrm{s}}^2$. What would the spring balance read when the balance

moves down with an acceleration $5 \mathrm{m} {\mathrm{s}}^{-2}$? $\left(g=10 \mathrm{m}/{\mathrm{s}}^2\right)$

A ball of $1 \mathrm{kg}$ drops vertically on the floor with a speed of $25 \mathrm{m}/\mathrm{s}$. It rebounds with a velocity of $10{ \mathrm{ms}}^{-1}$.

What impulse acts on the ball during contact?

A ball of $1 \mathrm{kg}$ drops vertically on the floor with a speed of $25 \mathrm{m}/\mathrm{s}$. It rebounds with a velocity of $10{ \mathrm{ms}}^{-1}$. If the ball is in contact for $0.02 s$, what is the average force exerted on the floor?