Posted by HELP on Saturday, December 11, 2010 at 10:07pm.
how much time does it take to fall 78m?
hf=1/2 g t^2
-78=1/2 9.8 t^2 solve for t.
how far horizontally? distance= 10m/s * time
The time required fir the keys to to fall H = 78 m is
T = sqrt(2H/g) = 3.99 seconds.
Multiply that by the initial velocity, which remains the constant horizontal velocity component during the fall to the ground below.
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