Answer:
-100000 N.
Explanation:
Force: This can be defined as the product of the mass of a body and it's acceleration. The S.I unit of Force is Newton(N). The Formula of force is given as,
F = ma ........................... Equation 1
Where F = Average force exerted on the car, m = mass of the car, acceleration of the car, a = acceleration of the car.
a = (v-u)/t..................... Equation 2
Where v = Final velocity, u = Initial velocity, t = time.
Substitute equation 2 into equation 1
F = m(v-u)/t............. Equation 3
Given: m = 1500 kg, u = 20 m/s, v = 0 m/s (brought to rest), t = 0.3 s.
Substitute into equation 3
F = 1500(0-20)/0.3
F = 1500(-20)/0.3
F = -100000 N.
Note: The negative sign is due to the fact that the force exerted on the car by the pole is equal and opposite the force of the car.
