Stone is dropped frm rest,frm point A on a cliff,it falls 64,8m to point C,B is a point one quarter of the way down.calculate the time the stone takes to fall frm A to C.
The time required to fall 64.8 meters, from A to C, is given by
64.8 = (g/2)*t^2 = 4.9 t^2
t = 3.64 s
You mention a point B, 1/4 of the way down, but you don't ask any question about B. The stone arrives there in half the time, 1.82 s.