Posted by **Allen** on Sunday, July 17, 2011 at 12:53am.

A rock thrown from a bridge hits the water below at a horizontal distance x directly below the throwing point. The rock travels a smooth parabolic path in time t.

a. Show that the virtical distance of the bridge above water is 1/2gt^2.

b. What is the height of the bridge if the time the rock is airborne is 2 seconds?

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