a stone is dropped from the roof the roof of a building .it takes 4 seconds to reach the ground.find the height of the buliding.[g=9.8m/s]

Question

a stone is dropped from the roof the roof of a building it takes 4
seconds to reach the ground find the height of the buliding [g=9
8m/s]

Nidhi · Answer

u=0
g=9 8 m/s2
t=4 sec
s=?
s=ut + (1/2)at2
=(1/2) 9 8 * 4 *4
=78 4 m