an athlete completes one round of a circular track of radius R in 40s. The displacement at the end of 2mins 20 secs will be??
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40 sec needed for 1 round. 80 will be needed for 2 rounds & 120 sec for 3 rounds..we have 2 min 20 sec I.e 140 sec..now in 1 round particle comes back to its initial position. So in 1 round net displacement is 0. Also in 3 rounds that is in 120sec it will be 0..now in last 20 sec the boy will cover half the circle since he need 40 sec for 1 round...so he is now 2R displaced from initial position.
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