Posted by **HELP** on Saturday, December 11, 2010 at 10:07pm.

You accidentally throw your car keys horizontally at 10.0 m/s from a cliff 78 m high. How far from the base of the cliff should you look for the keys?

- PHYSICS -
**bobpursley**, Saturday, December 11, 2010 at 10:09pm
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

- PHYSICS -
**drwls**, Saturday, December 11, 2010 at 10:11pm
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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