Heena Sharma, Shubhankat Vats and, Rashmi Gupta Solutions for Chapter: Force and Laws of Motion, Exercise 2: Check Point 02

Name the physical quantity whose SI unit is $\mathrm{kg} \mathrm{m} {\mathrm{s}}^{-1}$ and write the formula of that quantity.

If the ball is moving with certain velocity $v$ is reduced to half, then what will be the changes in the values of initial and final momentum?

If the ball is moving with certain velocity $v$ is reduced to half, then what will be the changes in the values of change of momentum?

A car is moving with velocity $108 \mathrm{km} {\mathrm{h}}^{-1}$. If driver of the car want to change its velocity from $108 \mathrm{km} {\mathrm{h}}^{-1}$ to $90 \mathrm{km} {\mathrm{h}}^{-1}$ in two minutes. Mass of the car is $300\mathrm{}\mathrm{k}\mathrm{g}$. What force applied by the brakes on the tyres?

Define the term impulse.

A force of $50 \mathrm{N}$ acts on a body for $\frac{1}{10} \mathrm{s}$. Find the change in the momentum of the body.