Mathematics 9709/42 — February/March 2020

Cambridge A-Level · Mechanics · worked solutions for every part, with the mark scheme

questions

marks

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Topics Kinematics of Motion in a Straight Line · Newton's Laws of Motion · Energy, Work and Power · Forces and Equilibrium · Momentum

Q1Energy, Work and PowerNewton's Laws of MotionFree sample

A lorry of mass $16\,000\text{ kg}$ 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 $10\text{ s}$ is $750\,000\text{ J}$ .

(a)

Find the power of the lorry's engine.

(b)

There is a constant resistance force acting on the lorry of magnitude $2400\text{ N}$ .

Find the acceleration of the lorry at an instant when its speed is $25\text{ m s}^{-1}$ .

The rest of this paper

6 more questions

Q2Kinematics of Motion in a Straight Line · Forces and Equilibrium · Newton's Laws of Motion6M
Q3Energy, Work and Power6M
Q4Kinematics of Motion in a Straight Line7M
Q5Forces and Equilibrium8M
Q6Newton's Laws of Motion · Kinematics of Motion in a Straight Line · Momentum9M
Q7Kinematics of Motion in a Straight Line10M

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