Find the traction force of a car if it starts to move and travels 400 meters in 20 seconds, the mass of the car is 1.5 tons.

Initial data: S (the way the car has traveled) = 400 m; t (movement time) = 20 s; m (vehicle weight) = 1.5 t; V0 (initial speed, the car was moving away) = 0 m / s.
SI system: m = 1.5 t = 1.5 * 1000 kg = 1500 kg.
1) Let’s calculate the acceleration of the car:
S = V0 * t + a * t ^ 2/2 = a * t ^ 2/2.
a = 2S / t ^ 2 = 2 * 400/20 ^ 2 = 2 m / s ^ 2.
2) Determine the traction force of the car engine:
F = m * a = 1500 * 2 = 3000 N = 3 kN.
Answer: The thrust force of the car engine is 3 kN.