Posted by Anonymous on Thursday, October 29, 2009 at 12:22pm.
Kinetic energy on the way up = kinetic energy on the way down, ignoring air-resistance.
Therefore speed going up = speed going down = 10 m/s.
Energy at window level = (1/2)mv0²+mgH
Energy at ground level = (1/2)mv²
Equate energies and solve for v.
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