Question

PROBLEM 9. 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 a straight path. Find the average
speed and average velocity of Usha.
(NCERT​

Answer 1

Answer:

Distance = 180 m  

Time = 1 min = 60sec  

Average speed = total distance covered / total time taken  

= 180m / 60 sec  

= 3m/s  

Displacement = 0m/s ( as Usha come back along the same path so, the Intial and final position is same )  

Average velocity = displacement/ time  

= 0m / 60 s  

=0m/s