October 14, 2015

Homework Help: physics

Posted by Dreskillz89 on Monday, September 28, 2009 at 4:23pm.

A ball is thrown upward off the top of a 30-meter high building. 10 meters below the top of the roof, is the top of a window, which is 2 meters high. How long (time) does it take for the ball to pass from top to bottom of the window?

What I have so far is:

-10 = v(initial) t - 4.9 t^2
-12 = v(initial) t - 4.9 t^2

How do I solve this question if I don't even have initial velocity?

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