Question

a stone is dropped from the edge of the room then how long does it take to fall 4.9 metre

Answer 1

S = 4.9 m , g = 9.8 m/s^2
u = 0 m/s
using

s = ut + 1/2 at^2
t = 1 sec

Answer 2

Answer Refer To attachment...☝☝

↪Hope this may helpful to uh ↩