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81.A bullet when passes through a wooden block losses 1/20 part of it's velocity u,then how many planks are required to stop the bullet (assuming constant retardation).length of a wooden plank is s. |
| Answer» 81.A bullet when passes through a wooden block losses 1/20 part of it's velocity u,then how many planks are required to stop the bullet (assuming constant retardation).length of a wooden plank is s. | |