Homework Help: Physics

Posted by Andrea on Monday, December 19, 2011 at 10:21am.

a stone falls from a rail road overpass which is 36ft. high into the path of the train which is approaching the overpass with the uniform speed, if the stone falls when the train is 50ft. away from the overpass and the stones hits the ground just as the train arrives at the spot. how fast is the train moving?

Physics - Henry, Tuesday, December 20, 2011 at 8:40pm
d = Vo*t + 0.5g*t^2 = 36 Ft.
0 + 16t^2 = 36,
t^2 = 24.42,
t = 4.94 s. = Time required for stone to hit ground.

d = V*t,
V = d / t 50/4.94 = 10.1 Ft/s.
Physics - Henry, Tuesday, December 20, 2011 at 8:48pm
Correction: t^2 = 36/16 = 2.25,
t = 1.5 s.

V = d / t = 50/1.5 = 33.33 Ft/s.

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