A car of mass $700{\text{ }}kg$ is travelling along a straight horizontal road. The resistance to motion is constant and equal to $600{\text{ }}N$.
a) Find the driving force of the car’s engine at an instant when the acceleration is $2{\text{ }}m{\text{ }}{s^{ - 2}}$.
b) Given that the car’s speed at this instant is $15{\text{ }}m{\text{ }}{s^{ - 1}}$, find the rate at which the car’s engine is working.
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