Two equal masses m1 and m2 moving along the same straight line with velocities + 3 m/s and – 5 m/s respectively collide elastically. Their velocities after the collision will be respectively

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+ 4 m/s for both

– 3 m/s and +5 m/s

– 4 m/s and + 4 m/s

– 5 m/s and + 3 m/s

answer is D.

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Detailed Solution

As m1=m2 therefore after elastic collision velocities of masses get interchanged i.e. velocity of mass m1=−5 m/sand velocity of mass m2=+3 m/s

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