# Physics

A bullet traveiling horizontally at aspeed of 350 m/!@#\$%^&s a board perpendicular to the surface, passes through it, and emerges on the side at a speed of 210m/s. if the board is 4.oo cm thick, how long does the bullet take to pass through it?

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1. The average speed of the bullet passing through is (1/2)(350 + 210) = 280 m/s. Divide the thickness (4*10^-2 m) by that speed to get the travel time.

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posted by drwls
2. .004/280=1/70

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posted by robert
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