How large a force (in newtons) is needed to accelerate a 3 metric-ton vehicle from rest to a speed of 50 km/hr in 4 s?

Answer 1

M = 3 metric tons = 3000 kg
top speed = 50 km/h = 13.89 m/s
acceleration = a = 13.89/4.0
= 3.47 m/s^2

Now use F = M a for the force in newtons

Answer 2

3000 kg x 3.47 m/s^2 but the answer is wrong.