Moderate -0.3 This is a straightforward application of the power-force-velocity relationship (P = Fv) to find driving force, followed by Newton's second law. It requires only two standard steps with no conceptual difficulty, making it slightly easier than average for A-level mechanics.
7 A train, of mass 22 tonnes, moves along a straight horizontal track. A constant resistance force of 5000 N acts on the train. The power output of the engine of the train is 240 kW .
Find the acceleration of the train when its speed is \(20 \mathrm {~ms} ^ { - 1 }\).
7 A train, of mass 22 tonnes, moves along a straight horizontal track. A constant resistance force of 5000 N acts on the train. The power output of the engine of the train is 240 kW .
Find the acceleration of the train when its speed is $20 \mathrm {~ms} ^ { - 1 }$.
\hfill \mbox{\textit{AQA M2 2013 Q7 [6]}}