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August 28, 2014

August 28, 2014

Posted by **Lauren01** on Wednesday, February 22, 2012 at 12:07pm.

- physics -
**Henry**, Thursday, February 23, 2012 at 6:46pmh = Yo*t + 0.5g*t^2 = 100 - 25 = 75 m.

o + 4.9t^2 = 75.

t^2 = 15.31 m.

Tf = 3.91 s. = Time to fall to roof.

Dx = Xo * Tf = 20 m.

Xo * 3.91 = 20.

Xo = 20 / 3.91 = 5.11 m/s. = hor. velocity.

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