In 20 seconds after the start of movement, the electric locomotive developed a speed of 4 m / s.

In 20 seconds after the start of movement, the electric locomotive developed a speed of 4 m / s. Find the force imparting acceleration if the mass of the electric locomotive is 184 tons.

a = (v-v0) / t, but since the train began to move not at a certain speed, but with v0 = 0 m / s, then a = v / t. a = 4/20 = 1/5 = 0.2 (m / s ^ 2)
According to Newton’s second law: F = ma, F = 184 * 10 ^ 3 * 0.2 = 36.8 * 10 ^ 3 (H) or 36.8 (kN)
Answer: F = 36.8 kN