A truck that travels on a level road at 60 km/h can be stopped by its brakes in a distance of 51 m. The mass of the truck is 5 tonnes and the resistance against motion is 3 615 N.

Question

Calculate the braking force in kN.

Answer 1

To calculate the braking force, we can use the equation:

Braking force = mass x acceleration

First, we need to calculate the acceleration of the truck using the equation:

Resistance force = mass x acceleration

3,615 N = 5,000 kg x acceleration
Acceleration = 3,615 N / 5,000 kg
Acceleration = 0.723 m/s^2

Now, we can calculate the braking force using the equation:

Braking force = mass x acceleration
Braking force = 5,000 kg x 0.723 m/s^2
Braking force = 3,615 N

Therefore, the braking force of the truck is 3.615 kN.