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A bom of mass 1 kg is thrown vertically ...

A bom of mass `1 kg` is thrown vertically upwards with a speed of `100m//s`. After 5 seconds, it explodes into two fragments. One fragment of mass `400 gm` is found to go down with a speed of `25m//s`. What will happen to the second fragment just after the explosion ? `(g=10ms^(-1))`

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