Question

A dancer is demonstrating dance steps along a straight line. The position-time graph is given above. Find the average velocity in the dance step depicted by AB.

• A. $1m{s}^{-1}$
  
• B. $1.33m{s}^{-1}$
• C. $2.75m{s}^{-1}$
• D. $0m{s}^{-1}$

Answer 1

The correct option is D $0m{s}^{-1}$

We see that AB is a line parallel to the time axis. Thus, the displacement for dance step AB will be zero and elapsed time from A to B is $(3-2)=1s$.

Thus, the average velocity $=\frac{displacement}{elapsedtime}=0/1=0m/s$