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NEET UG PHYSICS MCQ: MOTION IN A STRAIGHT LINE

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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

View answer and explanation

Correct option: A

\frac{{2{v_d}{v_u}}}{{{v_d} + {v_u}}}

Option A (

\frac{{2{v_d}{v_u}}}{{{v_d} + {v_u}}}

) is correct because the average speed is the total distance divided by the total time, which simplifies to the harmonic mean of the two speeds.

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. After how much time, the car catches up with the scooter? A motor vehicle travelled the first one third of a distance ‘S ’ at a speed of

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