Question

A falling stone takes 0.2 seconds to fall past a window which is 1 m high. From how far above the top of the window was the stone dropped?
Please explain in detail

Answer 1

Answer:

0.8 m

Explanation:

let the distance above the top of the window = h

h+1 = u(t+0.2) + 1/2 g(t+0.2)²

h = ut + 1/2 gt²

1 = 0.24u + 1/2 g(0.4t +0.04)

u = 0

1/2 g(0.4t +0.04) = 1

0.4t +0.04 = 0.2

t  = 0.4 sec

h = 5(0.16) = 0.8 m