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October 22, 2014

October 22, 2014

Posted by **Ava** on Wednesday, February 6, 2008 at 8:32pm.

Calculate the horizontal distance from the base of the building to the point where the rock strikes the ground.

- Physics -
**drwls**, Wednesday, February 6, 2008 at 9:07pmThis problem was posted before, perhaps by you, since "10.0-" is still written instead of 10.0 meters. You need to say what the dimensions are.

As I said in my previous answer, the kinetic energy increase by M g H, where H = 10 meters. Since kinetic energy is (1/2) m V^2, you can divide out the Mass and say that V^2 increases by gH. g is the acceleration of gravity.

- Physics (correction) -
**drwls**, Thursday, February 7, 2008 at 2:28amI meant to write (as I did when you asked the question before):

V^2 increases by 2gH.

g is the acceleration of gravity.

Therefore

Vfinal^2 = 30^2 + 2*9.8*10 = 1096 m^2/s^2

Vfinal = 33.1 m/s

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