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Q.

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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a

+ 4 m/s for both

b

– 3 m/s and +5 m/s

c

– 4 m/s and + 4 m/s

d

– 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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