A machine gun fires a bullet of mass $40\, g$ with a velocity $1200\, ms^{-1}$. The man  holding it, can exert maximum force of $144\, N$ on the gun. How many bullets can he  fire per second at the most ?

An object is thrown vertically upwards. At its maximum height, which of the following quantity becomes zero?

$Ns$ is unit of which quantity ? Write dimensional formula of momentum.

A spherical body of mass $100 \mathrm{~g}$ is dropped from a height of $10 \mathrm{~m}$ from the ground. After hitting the ground, the body rebounds to a height of $5 \mathrm{~m}$. The impulse of force imparted by the ground to the body is given by : (given $\mathrm{g}=9.8 \mathrm{~m} / \mathrm{s}^2$ )

Figures $(a), (b), (c)$ and $(d)$ show variation of force with time.

The impulse is highest in figure.

A rocket is propelled by a gas which is initially at a temperature of $4000\, K$. The temperature of the gas falls to $1000\, K$ as it leaves the exhaust nozzle. The gas which will acquire the largest momentum while leaving the nozzle, is