A body of mass $m$ collides against a wall with a velocity $v$ and rebounds with the same speed. Its change of momentum is

A rigid ball of mass $m$ strikes a rigid wall at $60^o $ and gets reflected without loss of speed as shown in the figure. The value of impulse imparted by the wall on the ball will be

In the figure, the position-time graph of a particle of mass $0.1\, kg$ is shown. The impulse at $t = 2\, second$ is ......... $kg\,ms^{-1}$

A block of mass $2\, kg$ is suspended $5\,m$ from a string, is released from a height of  $5\,m$ as shown in figure then what will be the impulse when string. Just becomes tight ............ $N-s$

A soldier with a machine gun, falling from an alrplane gets detached from his parachute. He is able to resist the downward acceleration, if he shoots $40$ bullets a second at the speed of $500 \,m / s$. If the weight of a bullet is $49 \,g$, the weight of the man .......... $ \,kg$ with the gun? Ignore resistance due to air and assume the acceleration due to gravity, $g=9.8 \,ms ^{-2}$.

A force of $50$ dynes is acted on a body of mass $5$ g which is at rest for an interval of $3$ seconds, then impulse is