Question

A baseball starts from rest and rolls 40.0 m down a hill in 10.0 seconds what is the acceleration

Answer 1

Acceleration is velocity over time. in order to find velocity, you divide distance over time
$v = \frac{d}{t} = \frac{40}{10} = 4 \\ a = \frac{v}{t} = \frac{4}{10} = 0.4 \: \frac{m}{ {s}^{2} }$