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[" (c) A bullet having a speed of "100m/...

[" (c) A bullet having a speed of "100m/sec" crashes through a "],[" plank of wood.After passing through a plank,its speed "],[" is "80m/s" .Another bullet of the same mass and size,but "],[" traveling at "80m/s" ,is fired at the plank.The speed of the "],[" second bullet after traveling through the plank is (Assume "],[" that resistance of the plank is independent of the speed of "],[" the bullet): "],[[" (a) "10sqrt(7)ms^(-1)," (b) "20sqrt(7)ms^(-1)],[" (c) "30sqrt(7)ms^(-1)," (d) "20sqrt(5)ms^(-1)]]

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