2 A minibus of mass 4000 kg is travelling along a straight horizontal road. The resistance to motion is 900 N .
- Find the driving force when the acceleration of the minibus is \(0.5 \mathrm {~m} \mathrm {~s} ^ { - 2 }\).
- Find the power required for the minibus to maintain a constant speed of \(25 \mathrm {~m} \mathrm {~s} ^ { - 1 }\).