Question

Rita swims in a 90m long pool, she covers 180m in one minute by swimming from one end to other and back along the same straight path.find the average speed and average velocity of rita.

Answer 1

total distance = 90+90 = 180 m
total time = 1 min = 60 sec
displacement = 90-90=0
average speed = total distance/ total time = 180/60 = 3m /sec
average velocity = displacement/ time = 0/60 = 0 m/s

Answer 2

average speed =total distance /total time taken
so , average speed = 180/given time
average velocity =displacement /time
so, average velocity = 0/given time
( 0 displacement because initial and finall position concide