Question

A stone falls from a ledge and takes 8 seconds to hit the ground. The stone has an original velocity of 0 m/s. How tall is the ledge?

Answer 1

Answer:

The ledge is 313.6 metres tall.

Explanation:

The height of a falling object, h, in terms of the seconds passed, t, is

h = 0.5(-9.8t^2) + v_0t + h_0

0 = -4.9(8)^2 + 0 + h_0

h_0 = 64 * 4.9

= 313.6 meters