Question

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

• A. $1m{s}^{-1}$
• B. $1.33m{s}^{-1}$
• C. $2.67m{s}^{-1}$
• D. $0.89m{s}^{-1}$

Answer 1

Answer: (C)

$2.67m{s}^{-1}$

From the diagram, the distance for dance step CD will be $4m$ and elapsed time from C to D is $(6-4.5)=1.5s$.

Thus, the average speed $=\frac{displacement}{elapsedtime}=4/1.5=2.67m/s$