A car weighing 4 tons, moving at a speed of 18 km / h, starts to brake and stops after 50 m.

A car weighing 4 tons, moving at a speed of 18 km / h, starts to brake and stops after 50 m. Determine the braking force.

Problem data: m (vehicle weight) = 4 t (in SI m = 4000 kg); V1 (speed of a given vehicle before braking) = 18 km / h (in SI V1 = 5 m / s); S (distance traveled during braking) = 50 m.

We calculate the braking force acting on a given car using the formula: F = m * a = m * (V1 ^ 2 / 2S).

Let’s perform the calculation: F = 4000 * 5 ^ 2 / (2 * 50) = 1 * 10 ^ 3 N (1 kN).

Answer: The braking force was 1 kN.