Question

A body completes one round of a circle of radius R in 20 sec.The displacement of the body after 45 sec.​

Answer 1

Answer:

20 sec = one round

1 sec = 1/20 round

45 sec = 1/20×45 rounds

= 9/4 rounds

Answer 2

Assuming uniform motion, after 45 seconds body will have finished

20/45 =2.25 rounds,

if it starts from A it will be at B after 45 seconds.

Now, displacement AB= root 2R.