1 A car of mass 900 kg travels along a horizontal straight road with its engine working at a constant rate of \(P \mathrm {~kW}\). The resistance to motion of the car is 550 N . Given that the acceleration of the car is \(0.2 \mathrm {~m} \mathrm {~s} ^ { - 2 }\) at an instant when its speed is \(30 \mathrm {~m} \mathrm {~s} ^ { - 1 }\), find the value of \(P\).