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COM in Collision and Explosion

68. A bullet ...

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68. A bullet of mass 200g hits a block of thickness 6cm with a speed of 100 m/s . It emerges with 10% of its initial KE . Find its emergent speed.

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Q. In a ballistics demonstration a police officer fires a bullet of mass

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Q. An bullet can travel in the air at a speed of 1000 kmph. When walls of 10 cm thickness are placed in its path, the speed at which the bullet emerges out of the last wall in its path diminishes by a quantity which varies as the square root of the number of walls placed in its path. With four walls its emergent speed is 300 kmph. The greatest number of walls that can be placed in front of the bullet so that the bullet emerges out of the final wall in its path is :___

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