Question

A can is dropped from rest at a height of 40.0 m above ground. How much time does it spend in the bottom half of its fall?

1. 0.873 s
2. 0.783 s
3. 0.837 s
4. 0.738 s

Answer 1

$t_0=\sqrt\frac{2s}g=2.857~s,$

$t_1=\sqrt\frac sg=2.02~s,$

$t_2=t_0-t_1=0.837~s.$