The weight of standard mass of $1 \mathrm{kg} \left({\mathrm{m}}_1\right)$ is found to be $4.7 \mathrm{N}$ when it is measured using a spring balance on the moon. An object of unknown mass ${\mathrm{m}}_2$ attached to the spring balance is found to weigh $11.11 \mathrm{N}$ on the moon. What is the mass of the object in terms of kilogram? (Give the answer in two decimal points)

A man kicks with his foot a soccer ball initially at rest. The ball has a mass of $10.73 \mathrm{kg}$ and attains a speed of  $74 \mathrm{m} {\mathrm{s}}^{-1}$ in $11$ micro seconds. What is the change in the momentum of the ball?

A man kicks with his foot a soccer ball initially at rest. The ball has a mass of $10.73 \mathrm{kg}$ and attains a speed of $74 \mathrm{m} {\mathrm{s}}^{-1}$ in $11$ micro seconds. What is the average force against the force during the impact?

If a boy is running, then what is the reason for him not stopping suddenly. Or a boy is running then he cannot stop suddenly. Why?

A cricket ball of $100 \mathrm{g}$ moving with a velocity of $30 \mathrm{m}/\mathrm{s}$ is brought to rest by a player in $0.05 \mathrm{s}$. Find the change in momentum of ball in terms of  $\mathrm{kg} \mathrm{m} {\mathrm{s}}^{-1}$.

A cricket ball of $100 \mathrm{g}$ moving with a speed of  $30 \mathrm{m}/\mathrm{s}$ is brought to rest by a player in $0.05 \mathrm{s}$. Find the average force applied by the player in newton.