Question

Phy - Q 3
3. Usha swims in a 90 m long pool. She covers 180 m in one minute by swimming from one end to the other and back along the same straight path. Find the average speed and average velocity of Usha.

Answer 1

Dear Student,

1. Average speed is calculated as the ratio of total distance travelled to time taken

Here Distance = 180 m and Total Time taken = 1 min = 60 s

Hence Average Speed of Usha = 180/60 = 3 m/s

2. Average velocity is calculated as the ratio of total displacement to time taken.

Here the net displacement = 0, as Usha reaches the starting point while covering 180 m and thus there is no change in position.

Thus the average velocity = 0/60 = 0

Regards