A-LevelMathematicsMechanics9709/43 · May/June 2020 · Q24 Marks
A minibus of mass 4000 kg is travelling along a straight horizontal road. The resistance to motion is 900 N.
- (a)Find the driving force when the acceleration of the minibus is 0.5 m s⁻².[2]
- (b)Find the power required for the minibus to maintain a constant speed of 25 m s⁻¹.[2]
Mark scheme
Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.
- [M1] F – 900 = 4000 × 0.5 (for use of Newton's second law, 3 terms)
- [A1] F = 2900 N
- [M1] 900 × 25 (for use of P = Fv with F = resistance only)
- [A1] 22 500 W or 22.5 kW
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