Question

A ball is dropped from the edge of a roof.It takes 1s to cross a window of heigh 7.9m.Find the height of the roof above the top of the window

Answer 1

Answer:

0.4205 m.

Explanation:

h+7.9 = g(t+1)²/2

h = gt²/2

g(2t +1) = 15.8

2t+1 = 1.58

t = 0.29 s

h = 5(0.29)² = 0.4205 m.