Two particles P and Q simultaneously start moving from point A with velocities 15 m/s and 20 m/s, respectively. The two particles move with accelerations equal in magnitude but opposite in direction. At some instant velocity of P is 30 m/s. The velocity of Q at this instant

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5 m/s

30 m/s

20 m/s

15 m/s

answer is A.

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Detailed Solution

For P, 30=15+at or at=15 m/sFor Q, v=20-at or v=20-15=5 m/s

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