# A glass falls off a shelf. How fast is the glass moving after 0.4 seconds?

Dec 5, 2015

$3.92 \text{m/s}$

#### Explanation:

Use the equation of motion:

$v = u + a t$

This becomes:

$v = 0 + \text{g} t$

$\therefore v = 9.8 \times 0.4 = 3.92 \text{m/s}$