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From the top of a tower of height 100 m ...

From the top of a tower of height `100 m` a `10 gm` block is dropped freely and a `6 gm` bullet is fired vertically upwards from the foot of the tower with velocity `100 ms^(-1)` simultaneously. They collide and stick together. The common velocity after collision is `(g = 10 ms^(-2))`.

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