Let us express and calculate the traction force of the diesel locomotive from the power formula (the movement of the locomotive must be considered uniform, the speed is constant):
N = F * V, where N is the power of the locomotive (N = 4200 kW = 4200 * 10 ^ 3 W), F is the required traction force of the locomotive (N), V is the speed of the locomotive (V = 90 km / h = 90 * 1000 / 3600 m / s = 25 m / s).
F = N / V = 4200 * 10 ^ 3/25 = 168 * 10 ^ 3 H = 168 kN.
Answer: The traction force of the locomotive is 168 kN.
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