A bullet of mass m moving horizontally with speed u meets a block of wood...

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Physics

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A bullet of mass m moving horizontally with speed u meets a block of wood of mass M travelling along the same line but in the opposite direction with speed U and remains embedded in it Show that the loss of kinetic energy is of the form kMm where k is in terms of u U m M and find the loss in KE when the bullet of mass 20 g travelling at 400 m s hits a block of wood mass 4 0 kg moving at 2 0 ms

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