A body of mass `2 kg` is projected upward from the surface of the ground at `t = 0` with a velocity of `20 m//s`. One second later a body B, also of mass `2 kg`, is dropped from a height of `20m`. If they collide elastically, then velocities just after collision are :-A. `v_(A) = 5 m//s` downward, `v_(B) = 5 m//s` upwardB. `v_(A) = 10 m//s` downard, `v_(B) = 5 m//s` upwardC. `v_(A) = 10 m//s` upward, `v_(B) = 10 m//s` downwardD. both move downward with velocity `5 m//s`

A body of mass `2 kg` is projected upward from the surface of the grou

1.	A body of mass `2 kg` is projected upward from the surface of the ground at `t = 0` with a velocity of `20 m//s`. One second later a body B, also of mass `2 kg`, is dropped from a height of `20m`. If they collide elastically, then velocities just after collision are :-A. `v_(A) = 5 m//s` downward, `v_(B) = 5 m//s` upwardB. `v_(A) = 10 m//s` downard, `v_(B) = 5 m//s` upwardC. `v_(A) = 10 m//s` upward, `v_(B) = 10 m//s` downwardD. both move downward with velocity `5 m//s`
Answer» Correct Answer - A After `1 s , v_(A) = 20 - 10 xx 1 = 10 m//s` and `v_(B) = 0 + 10 xx 1 = 10 m//s` At the time of collision `V_(A) = V_(B) = 5m//s` after collision, velocity gets enterchanged.

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