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Q.

A ball of 4 kg mass moving with a speed of 3 ms-1 has a head on elastic collision with a 6 kg mass initially at rest. The speeds of both the bodies after collision are respectively

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a

0.6 ms-1 , 2.4 ms-1

b

-0.6 ms-1 , -2.4 ms-1

c

-0.6 ms-1 , 2.4 ms-1

d

0.6 ms-1 ,-2.4 ms-1

answer is C.

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Detailed Solution

v1→=m1-m2m1+m2u1→+2m2m1+m2u2→ v2→=2m1m1+m2u1→+m2-m1m1+m2u2→
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A ball of 4 kg mass moving with a speed of 3 ms-1 has a head on elastic collision with a 6 kg mass initially at rest. The speeds of both the bodies after collision are respectively