# What is the change in velocity of a brick that falls for 3.5 seconds?

Assume initial velocity $v = 0$
$g = 9.8 \frac{m}{s} ^ 2$
final velocity $v ' = v + g \cdot t$
$v ' = 0 + 9.8 \cdot 3.5$
$v ' = 34.3 \frac{m}{s}$