Help with acceleration problem?

Question

By how much does the speed of a vehicle moving in a straight line change each second when it is acceleration at 2 km/h.s? At 4 km/h.s? at 10km/h.s?

Answer 1

v = u + at

(v-u) = at

At 2km/h^2
(v-u) = 2/(60*60) = 0.000556 km/h

At 4km/h^2
(v-u) = 4/(60*60) = 0.00111 km/h

At 10km/h^2
(v-u) = 10/(60*60) =0.002778 km/h

Answer 2

2 km/h
4 km/h
10km/h