A car moves from X to Y with a uniform speed v_u and returns to Y with a uniform speed v_d. The average speed for this round trip is

NEET 2007 Physics question

Physics Motion in a Straight Line NEET 2007

A car moves from X to Y with a uniform speed and returns to Y with a uniform speed . The average speed for this round trip is

(1)
(2)Correct
(3)
(4)

Answer: (2)

Solution

As printed, the stem says the car "returns to Y"; it is meant to return to X (the round trip). Let the distance XY be . Time from X to Y: ; time for the return: . Average speed \frac{total distance}${\text{total

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Question ID VK-089887