A stone falls from a railroad overpass which is 36ft high into the path of a train which is approaching the overpass with uniform speed if the stone falls when the train is 50ft away from the overpass?

Answer 1

given:h=36ft

d=50ft

g=32ft/s2

t=(2h/g)1/2

t={ [(2)(36ft)] / (32ft/s2) }1/2

t=[ (72ft) / (32ft/s2) ]1/2

t=(2.5)1/2

t=1.5s the time the stone falls from the overpass

v=d/t

v=(50ft) / (1.5s)

v=33.33ft the speed of the train