Question

A stone is released freely from a 200 m tall building. Calculate the final veocity of the stone just before touching the ground. Ignore the friction of air. (use g = 9.81 ms-1)

Answer 1

From the conservation of energy:

$$0.5mv^2=mgh$$

$$v^2=2gh\to v^2=2(9.81)(200)$$

$$v=62.6\frac{m}{s}$$