Question

a body completes one round of a circle of r in 20 sec the displacement of the body after 45 sec is

Answer 1

Explanation:

after 20 sec the displacement by man will be zero.

in the same method after 40 sec displacement will again zero .

2pie r distance covered in 20 sec

so ,1/2 pie r distance will be cover in 5sec .

so, displacement =)1/2 pie r.