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.
Answer This Question
Related Questions
 Phyiscs  A stone falls from a railroad overpass which is 36 ft high into the ...
 physics  A boy lining a railway bridge 49ft. high, sees a train uproaching with...
 Physics  While standing at the edge of the roof of a building, you throw a ...
 physics  While standing at the edge of the roof of a building, you throw a ...
 physics  While standing at the edge of the roof of a building, you throw a ...
 physics  While standing at the edge of the roof of a building, you throw a ...
 Physics  While standing at the edge of the roof of a building, you throw a ...
 Physics  While standing at the edge of the roof of a building, you throw a ...
 Physics  While standing at the edge of the roof of a building, you throw a ...
 Physics  A person standing close to a railroad crossing hears the whistle of an...
More Related Questions