Dr. K.Prabhakara Reddy, Shobana Ramkumar, Dr. Gayatri Ramachandran and, G. Devika Solutions for Chapter: Motion, Exercise 2: Evaluation

Show with the help of graphical representation how to find velocity from a displacement-time graph.

A person jogs $4.0 \mathrm{km}$ in $32 \mathrm{minutes}$, then $2.0 \mathrm{km}$ in $22 \mathrm{minutes}$, and finally $1.0 \mathrm{km}$ in $16 \mathrm{minutes}$. What is the jogger’s average speed in $\mathrm{km} \mathrm{per} \mathrm{minute}$ ?

An object is falling from a tall building. How much time will it take to reach a velocity of $49 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$? Acceleration due to gravity is $9.8 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{s}}^2$}\right.$.

How long will it take a car to accelerate from $15.3 \mathrm{m}/\mathrm{s}$ to $24.6 \mathrm{m}/\mathrm{s}$ if the car has an average acceleration of $3.1 \mathrm{m}/{\mathrm{s}}^2$? 

A child drops a ball from a window. The ball strikes the ground in $4$ seconds. What is the velocity of the ball the instant before it hits the ground?

What is the acceleration of a car that travels in a straight line at a constant speed?

Describe a situation where you can accelerate but the speed doesn’t change.

If the speedometer of your car reads a constant speed of $60 \mathrm{km}/\mathrm{h}$, can you say for sure that the car has a constant velocity? Explain your answer.