Posted by **Stone** on Monday, September 5, 2011 at 9:42am.

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

- Phyiscs -
**bobpursley**, Monday, September 5, 2011 at 11:20am
find time to fall.

h=1/2 g t^2 find time. g=32ft/sec^2

Now, the train: d=rt

50ft=v*t

v will be in ft/sec

- Phyiscs -
**Henry**, Wednesday, September 7, 2011 at 2:13pm
d = Vo*t + 0.5gt^2 = 36 ft.

0 + 0.5*32t^2 = 36,

16t^2 = 36,

t^2 = 2.25,

t = 1.5s.

d = Vt,

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

## Answer This Question

## Related Questions

- Physics - a stone falls from a rail road overpass which is 36ft. high into the ...
- Physics - A person standing close to a railroad crossing hears the whistle of an...
- Physics doppler effect - A person standing close to a railroad crossing hears ...
- 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 ...

More Related Questions