A bullet of mass 0.04 kg moving with a speed of 90 m s⁻¹ enters a heavy wooden block and is stopped after a distance of 60 cm. What is the average resistive force exerted by the block on the bullet?
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The retardation 'a' of the bullet (assume constant) is given by
The retarding force, by the Second Law of motion, is
The actual resistive force, and therefore, retardation of the bullet may not be uniform. The answer therefore, only indicates the average resistive force.
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