Question

A dancer demonstrating dance steps along a straight line. The displacement time graph is given.

Find the average speed for the dance step depicted by CD.

• A. $1m{s}^{-1}$
• B. $2m{s}^{-1}$
• C. $2.75m{s}^{-1}$
• D. $0.89m{s}^{-1}$

Answer 1

Answer: (B)

$2m{s}^{-1}$

Average speed is defined as the ratio of the distance covered to the total time taken .

Average speed $s_{av}=\frac{Distancecovered}{timetaken}$

For step CD

Initial position is $4$, final position is $0$, hence distance covered $=4m$

Total time is $6-4=2sec$

So average speed is $s=\frac{4}{2}=2m/s$

So option $B$ is correct.