Question

A 10-kg metal ball is dropped from the top of a building 5.0 - m high. How long will it take this object to hit the ground? Neglect air resistance.

Answer 1

$v_0 = 0$

$s = 5 m$

$g= 9.81\frac{m}{s^2}$

$s = v_0t+\frac{gt^2}{2}$

$t = \sqrt{\frac{2s}{g}}= \sqrt{\frac{10}{9.81}}\approx1s$

$\text{Answer: }1s$