Posted by Hannah on Saturday, May 26, 2012 at 11:04pm.
1) A penny is dropped from rest from the top of a very tall building. Assuming the height of the building is 407 m and ignoring air resistance, find the speed with which the penny strikes the ground.
I am not sure how to start this. Thank you!

Physics(Please respond)  drwls, Sunday, May 27, 2012 at 12:48am
V = sqrt(2 g X)
Why? Because
M g X = (1/2) M V^2