When a force of $40\, N$ is applied on a body,it moves with an acceleration of $5\, m s^{-2}$. Calculate the mass of the body. (in $kg$)

Which has a higher value of momentum: $A$ bullet of mass $10 \, g$ moving with a velocity of $400 \, m s^{-1}$ or a cricket ball of mass $400 \, g$ thrown with a speed of $90 \, km h^{-1}$?

State whether the following statement is true or false:
Impulse represents the rate of change of momentum of a body.

How much momentum will a dumbbell of mass $10 \, kg$ transfer to the floor,if it falls from a height of $0.8 \, m$? Take acceleration due to gravity as $10 \, m s^{-2}$.

Look at the diagram below and answer the following questions:
$(i)$ When a force is applied through the free end of the spring balance $A$,the reading on the spring balance $A$ is $20 \ g \ wt$. What will be the reading shown by the spring balance $B$?
$(ii)$ Write the reason for your answer.
$(b)$ If a balloon is filled with air and its mouth is untied,air is released from its mouth in the downward direction. Write the other observations made by you and justify your answer.

Which of the following has the largest inertia?