physics...i know this i ssimple but i completly blancked out!!!?

Question

1. calculate the acceleration of a car in (in km/h times s)that can go from restto 100km/h in 10s
2. calculate the instantaneous speed (in m/s)at the 10-second markfor a car that acceleratesat 2 m/s square from a position of rest

Answer 1

For the first Problem

(100km/h)/(10s)=10km/(h*s)

For the last Problem

a=acceleration

v=speed

a=2m/s^2

v=t*2m/s^2 + C

Since the car started from rest C=0

if t=10s

(10s)*2m/s^2=20m/s