S K Sharma Solutions for Chapter: Motion, Exercise 2: UNSOLVED NUMERICALS FOR PRACTICE

A $200 \mathrm{m}$ long train crosses a $400 \mathrm{m}$ long bridge with a speed of $36 \mathrm{km} {\mathrm{h}}^{-1}$. Calculate the time taken by the train to cross the bridge.

A non-stop bus goes from one station to another station with a speed of $54 \mathrm{km} {\mathrm{h}}^{-1}$. The same bus returns from the second station to the first station with a speed of $36 \mathrm{km} {\mathrm{h}}^{-1}$. Find the average speed of the bus for the entire journey.

A train travels $20 \mathrm{km}$ at a uniform speed of $60 \mathrm{km} {\mathrm{h}}^{-1}$ and the next $20 \mathrm{km}$ at a uniform speed of $80 \mathrm{km} {\mathrm{h}}^{-1}$. Calculate its average speed.

Sound is heard after $2 \mathrm{s}$, the lightning is seen in the sky during a cloudy day. Find the distance of the location of lightning, if speed of sound is $346 \mathrm{m} {\mathrm{s}}^{-1}$.