Question

An athlete completes one round of a circular track of radius R in 40 sec . What will be his displacement at the end of 2 minutes 20seconds?

Answer 1

2 min 20 second = 140 second.
he completed one round in 40 second.
in 140 seconds, he will cover= 140/40=3.5 round.
after 3.5 rounds, he would be on the opposite side of the starting point.
So the displacement will be the diameter or 2R.