Question

find the average force needed to accelerate a car weighing 500 kg from rest to 72 km per hour in a distance of 25 m

Answer 1

a = (v^2 - u^2) / (2S)
= [(72 × 5/18 m/s)^2 - 0] / (2 × 25 m)
= 400 / 50 m
= 8 m/s^2

F = m a
= 500 kg × 8 m/s^2
= 4000 N
= 4 kN

Average Force needed is 4 kN