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A bomb of mass \(1\ kg\) is thrown vertically upwards with a speed of \(100\ ms^{-1}\). After \(5\ seconds\), it explodes into two fragments. One fragment of mass \(400\ gram\) is found to go down with a speed of \(25\ ms^{-1}\). What will happen to the second fragment just after the explosion? (\(g\ =\ 10\ ms^{-2}\))