Homework Help: calculus

Posted by anonymous on Monday, February 27, 2012 at 12:26pm.

A light is attached to the wall of a building 64 feet above
the ground. A ball is dropped from the same height, but 20
feet away from the side of the building. The height y of the
ball at time t is given by y(t) = 64 − 16t
2
. How fast is the
shadow of the ball moving along the ground after 1 second?

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