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25. A short is traveling at a rate of 100m/s is just able to Pierce a plank of 4cm thick, what velocity is required to just Pierce a plank of 9cm thick ? |
| Answer» 25. A short is traveling at a rate of 100m/s is just able to Pierce a plank of 4cm thick, what velocity is required to just Pierce a plank of 9cm thick ? | |