posted by Adelaide .
If the force
of the road on the car's wheels, pushing it forward, is a constant 3.5 kN, and the car's mass is 2 kg, then how long will the car take to go from 15 m/s to 50 m/s?
a = F/m = 3500/2 = 1750 m/s^2
t = (V-Vo)/a = (50-15)/1750 = 0.02 s.