Question

a cyclist is moving on a circular track of radius 40 m completes half a revolution in 40 s. its average velocity (in m/s) is:

Answer 1

2 m/s

Step-by-step explanation:

We know average velocity = Displacement/Time

• v(av) = S/T

Given,

Radius of circular track = 40 m

Time taken = 40 s

By definition, displacement (S) means the shortest possible distance between initial and final positions.

In a circular track, the shortest path or displacement is its diameter.Also, the cyclist completes half a revolution, as a hint of this question.

Hence, S = 2* radius = Diameter

• S = 2* 40 m = 80 m

Hence, V(av) = S/T = 80/40 = 2 m/s

Hence the cyclist's average velocity for the journey = 2 m/s