A-LevelMathematicsMechanics9709/42 · Feb/Mar 2020 · Q14 Marks
A lorry of mass 16000 kg is travelling along a straight horizontal road. The engine of the lorry is working at constant power. The work done by the driving force in 10 s is 750 000 J.
- (a)Find the power of the lorry's engine.[1]
- (b)There is a constant resistance force acting on the lorry of magnitude 2400 N. Find the acceleration of the lorry at an instant when its speed is 25 ms⁻¹.[3]
Mark scheme
Marking points from the official mark scheme (Feb/Mar 2020). The mark or mark type is shown in brackets.
- [B1] Power = WD/Time
- [B1FT] Using P = DF × v
- [M1] Using Newton's 2nd law
- [A1] Allow a = 3/80
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