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
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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
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