n a ballistics demonstration a police officer fires a bullet of mass 40.0 g with speed 200 m/s on a soft plywood of thickness 4.00 cm. The bullet emerges with only 25% of its initial kinetic energy. The emergent speed of the bullet will be
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In a ballistic demonstration, a police officer fires a bullet of mass 50 g with speed of 200ms−1 on soft plywood of thickness 2 cm. The bullet emerges with only 10 % of its initial kinetic energy.