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A bullet moving with a speed of 150 ms^(-1) strikes a wooden plank. After passing through the plank its speed becomes 125 ms^(-1). Another bullet of the same mass and size strikes the plank with a speed of 90 ms^(-1). Its speed after passing through the plank would be: |
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Answer» `50 ms^(-1)` `:. Fxxx=1/2m[(150)^(2)-(125)^(2)]` Also `Fxxx=1/2m[(90)^(2)-V^(2)]` `:. (150)^(2)-(125)^(2)=(90)^(2)-v^(2)` Solving it,we get v=35 m/s. |
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