Question

A body travels along a circular path of radius 60 cm after travelling half a revolution in 20 second find average speed and velocity

Answer 1

18.86 cm/s speed
10cm/s velocity

Answer 2

A body travel half of circumference of circle.
We know how find curcumference of circle = 2πr

And also it cover half,

Then half the curcumference = 2πr/2
= πr

Given, r=60cm and value of π= 3.14

Putting the value,
= 3.14 * 60
= 188.40 cm

Now, we find speed

So, speed = distance/time
[t =20s]
= 188.40/20
=9.42 cm/s

And, velocity = displacement/time

Displacement = short distance b/w initial and final distance= diameter = 120 cm

So, v = 120/20
= 6 cm/ s

I hope, its helpful for you...