A wooden block of mass `10 gm` is dropped from the top of a cliff `100 m` high. Simultaneously a bullet of same mass is fired from the foot of the cliff vertically upwards with a velocity of `100 ms^(-1)`. If the bullet after collision gets embedded in the block, the common velocity of the bullet and the block immediately after collision is `(g=10 ms^(-2))`.A. `40 ms^(-1)` downwardB. `40 ms^(-1)` upwardC. `80 ms^(-1)` upwardD. zero

A wooden block of mass `10 gm` is dropped from the top of a cliff `100

1.	A wooden block of mass `10 gm` is dropped from the top of a cliff `100 m` high. Simultaneously a bullet of same mass is fired from the foot of the cliff vertically upwards with a velocity of `100 ms^(-1)`. If the bullet after collision gets embedded in the block, the common velocity of the bullet and the block immediately after collision is `(g=10 ms^(-2))`.A. `40 ms^(-1)` downwardB. `40 ms^(-1)` upwardC. `80 ms^(-1)` upwardD. zero
Answer» Correct Answer - B Time after which collision takes place`t = (h)/(u)` before collsion, initial velocity of the wooden block `u_(1) = u-g t` `rArr m_(1)u_(1) -m_(2)u_(2) = (m_(1) + m_(2)) v`.

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