A train weighing 5 tons, moving in a straight line, increased its speed from 18 km / h to 54 km / h.

A train weighing 5 tons, moving in a straight line, increased its speed from 18 km / h to 54 km / h. Find the change in momentum.

The train impulse change can be calculated by the formula:

РΔt = mV2 – mV1 = m * (V2 – V1), where m is the mass of the train (by the condition m = 5t = 5000 kg), V2 is the final speed of the train (by the condition V2 = 54 km / h or 54/3, 6 = 15 m / s), V1 is the initial speed of the train (according to the condition V1 = 18 km / h or 18 / 3.6 = 5 m / s).

Let’s do the calculation:

РΔt = 5000 * (15 – 5) = 5000 * 10 = 50,000 kg * m / s.

Answer: The change in the impulse of the train is 50,000 kg * m / s.