A motorist drives along a straight road at a constant speed…

A motorist drives along a straight road at a constant speed of 10 m/s. At t=0 she passes a parked motorcycle police officer, and the officer takes off after her with a varying acceleration given by: a(t) = bt, where b is a constant and t is time. If the officer maintains this acceleration, what is the speed, in m/s, of the police officer when he reaches the motorist?