Define linear momentum. Write its formula. Give its SI unit. Is it a scalar or a vector quantity?

What is Newton's second law?

Why a cricketer lower his hands while catching a ball?

A constant force of $15 \mathrm{N}$ acts on a body of mass $5 \mathrm{kg}$. Find the acceleration produced.

What force is required to produce an acceleration of $2 \mathrm{m} {\mathrm{s}}^{-2}$ a body of mass $10 \mathrm{kg}$?

A car moving with a speed of $72 \mathrm{km} {\mathrm{h}}^{-1}$ stops in $5 \mathrm{seconds}$ application of brakes. Assuming retardation to be uniform, find the retarding force. The mass of the car is $1000 \mathrm{kg}$.

What is the amount of force required to a velocity of a car by $30 \mathrm{m} {\mathrm{s}}^{-1}$ starting from rest. It is given that the time taken is $10 \mathrm{s}$  and the mass of the car is $1000 \mathrm{kg}$.

The graph shows the retardation of a car of $1000 \mathrm{kg}$. Find the retarding force.    

A boy is standing on a horizontal surface wearing skates. What will the boy experience if he pushes the wall?