Question

a particle is moving in a circle of diameter 5m . calculate the distance covered and displacement when it completes 3 revolutions

Answer 1

Hey ,

★Circumference = 2πr
2 . 22\7 . 5\2
220\14

★now , distance = 3× 220\14
660\14 = 330\7 = 47.1 m
.
★and displacement = 0 m (as final point = initial point)

★I.E.after 3 rounds the particle will be at the place where it started .

Wish it works

Answer 2

Given -
No. of revolution = n = 3
diameter = 5m
so radius = r = 5/2m

Now
Distance covered = No. revolution * circumference of circle
                             = n * 2πr
                             = 3 * 2π(5/2)
                             = 3 * π(5)
                             = 15 π
                             = 15 * 3.14         {Since π= 3.14}
                             = 47 .1 m 

Now
Displacement = 0
{Since  displacement is the final position - initial position }

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Best of luck ;)
ROYALJATT