Question

A stone is dropped from rest from a bridge. Three seconds later, the impact of the stone with the water is heard. How high is the bridge ?

Answer 1

u=0,g=10m/s^2,t=3s,s=?
According to second equation of free fall
s=ut+1/2gt^2
s=0*3+1/2*10*(3)^2
s=9*5=45m