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Can somebody please help me with this mechanical power question? Im not quite sure how to do it!
Reading from the graph, the train accelerates from 0 to 40m/s in 180 seconds. The acceleration is constant until 180 seconds.
Because of that, after 90 seconds, the train must be travelling at 20 m/s.
So now use the formula for kinetic energy (K.E.) to work out the energy converted in the process of getting the train to travel at 20 m/s.
With that answer, use the power formula above to find the answer.