Question

a car travels along on a straight line with speed 40 km per hour from a to b and turns back from B to a with speed 60 km per hour find the average speed of the car and its average velocity

Answer 1

average velocity is 0 as car returned to the same place
and for average speed,
when distance is same avg. speed is calculated using this formula
2xy/x+y
so
2 x 40 x 60 /100=48km/h

Answer 2

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____Answer is in Attachment !!______

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Hope it helps...

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