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June 2012 p41 q1
3468
A car of mass 880 kg travels along a straight horizontal road with its engine working at a constant rate of \(P\) W. The resistance to motion is 700 N. At an instant when the car's speed is 16 m s-1 its acceleration is 0.625 m s-2. Find the value of \(P\).
Solution
Using Newton's second law, the net force \(F\) acting on the car is given by: