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A particle of mass m moving with velocity 2ms−1 collides elastically with a particle of mass 4 m at rest. After collision the heavier particle moves with velocity (ms−1 ) .The velocity of the colliding particle after collision is (ms–1)

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a

1

b

1.2

c

4

d

3

answer is B.

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Detailed Solution

v1=m1−m2m1+m2u1 =m−4mm+4m×2 = −1.2ms−1

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A particle of mass m moving with velocity 2ms−1 collides elastically with a particle of mass 4 m at rest. After collision the heavier particle moves with velocity (ms−1 ) .The velocity of the colliding particle after collision is (ms–1)