Question

A particle is moving in a circle of diameter 5 m find out the the diatance and displacement after 2 revolutions

Answer 1

For the circular path,
diameter, d = 5 m 
Number of revolutions = 2

So, DIstance covered = 2 * Circumference
                                   = 2 * πd
                                   = 2 * 22/7 * 5
                                   = 220/7
                                   ≈ 31.43 m

Moreover, the particle comes back to its starting point after 2 revolutions. So, the displacement is 0 m.

Answer 2

Radius is 2.5 m
   Distance if 2 * Circumference of Circle=2(2*pi*r)=2 x 2 x 3.14 x 2.5=31.4m
Net Linear displacement is Zero Because Particle Returns to its mean Position