Stationary target and emerges with a speed of 900 ms. the, Ask an Expert

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In a ballistics test, a 22.0 g bullet traveling horizontally at 1300 m/s goes through a 40.0 cm-thick 450 kg stationary target and emerges with a speed of 900 m/s. The target is free to slide on a smooth horizontal surface. How long is the bullet in the target?

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