Question

what is the average acceleration of a four wheeler that speeds up from 3 miles per hour to 15 miles per hour in 0.6 hours

Answer 1

a= change in velocity / change in time

$a = \frac{change \: in \: velocity}{change \: in \: time}$
$a = \frac{15 - 3}{0.6}$
$a = 20 \: \frac{m}{ {s}^{2} }$