Lakhmir Singh and Manjit Kaur Solutions for Chapter: Motion, Exercise 2: Short Answer Type Questions

The displacement of a moving object in a given interval of time is zero. Would the distance travelled by the object also be zero? Give reason for your answer.

A snail covers a distance of $100 \mathrm{m}$ in $50 \mathrm{h}$. Calculate the average speed of snail in $\mathrm{km} {\mathrm{h}}^{-1}$.

A tortoise moves a distance of $100 \mathrm{m}$ in $15 \mathrm{minutes}$. What is average speed of tortoise in $\mathrm{km} {\mathrm{h}}^{-1}$?

If a sprinter runs a distance of $100 \mathrm{metres}$ in $9.83 \mathrm{seconds}$, calculate his average speed in $\mathrm{km} {\mathrm{h}}^{-1}$. 

A motorcyclist drives from place $A$ to $B$ with a uniform speed of $30 \mathrm{k}\mathrm{m}{\mathrm{h}}^{-1}$ and returns from place $B$ to $A$ with a uniform speed of $20 \mathrm{k}\mathrm{m}{\mathrm{h}}^{-1}$. Find his average speed.

A motorcyclist starts from rest and reaches a speed of $6 \mathrm{m} {\mathrm{s}}^{-1}$ after travelling with uniform acceleration for $3 \mathrm{s}$. What is his acceleration?

An aircraft travelling at $600 \mathrm{km} {\mathrm{h}}^{-1}$ accelerates steadily at $10 \mathrm{km} {\mathrm{h}}^{-1}$ per second. Taking the speed of sound as $1100 \mathrm{km} {\mathrm{h}}^{-1}$ at aircraft's altitude, how long will it take to reach the 'sound barrier'?

If a bus travelling at $20 \mathrm{m} {\mathrm{s}}^{-1}$ is subjected to a steady deceleration of $5 \mathrm{m} {\mathrm{s}}^{-2}$, how long will it take to come to rest?