A car of mass 800 kg is at rest. The engine exerts a resultant force of 2000 N for a distance of 5 m. a) What is then the car's kinetic energy? b) What is then the car's speed?

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a) This question involves the work-energy theorem, which states that the work of the external forces acting on a system equals the change of the kinetic energy of the system.

In this case, the external force is the force produced by the engine (even though the engine is of course inside the car, there are outside sources, such as an...

(The entire section contains 195 words.)

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