2 A car of mass 1400 kg is moving along a straight horizontal road against a resistance of magnitude 350 N .
- Find, in kW , the rate at which the engine of the car is working when it is travelling at a constant speed of \(20 \mathrm {~m} \mathrm {~s} ^ { - 1 }\).
- Find the acceleration of the car when its speed is \(20 \mathrm {~m} \mathrm {~s} ^ { - 1 }\) and the engine is working at 15 kW .