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A bullet is fired on a fixed target. It ...

A bullet is fired on a fixed target. It penetrates inside the target through distance d = 4 cm and then stops, mass of bullet is m = 1kg and of target is M = 4kg . Now identical bullet moving with same velocity is fired on identical which is placed at rest on frictionless horizontal surface. The distance ( in mm ) to which the bullet will penetrate inside the target is 4K ( mm). Find K .

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