Question

A child moving on a circular track of radius 40 meter completes one revolution in 5 minutes.

Answer 1

Answer:

radius=40 m

circumference=22/7 ×40^2

=5026.5 m

So

distance travelled =5026.5m

Time taken=5 minutes or 300 seconds

Average speed=Distance/ Time

=5026.5/300

=16.75m/a

After completing one revolution the total displacement of the child is zero

hence Average velocity=Displacement / Time

=0/300seconds

=0