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A bullet having a speed of 100 m//see cr...

A bullet having a speed of `100 m//see` crashes through a plank of wood. After passing through a plank , its speed is `80 m//s`. Another bullet of the same mass and size , but traveling at `80 m//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) :

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