A lorry of mass $$$16000 \mathrm{~kg}$$$ 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 $$$10 \mathrm{~s}$$$ is $$$750000 \mathrm{~J}$$$. Find the power of the lorry's engine. .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... ....................................................................................................................................................

Mathematics

IGCSE&ALevel

CAIE

Exam No：9709_m20_qp_42 Year：2020 Question No：1(a)

Answer:

Power $=750000 / 10=75000 \mathrm{~W}$ or $75 \mathrm{~kW}$

Knowledge points:

4.5.4 use the definition of power as the rate at which a force does work, and use the relationship between power, force and velocity for a force acting in the direction of motion Including calculation of (average) power;P = Fv

Answer:

Knowledge points:

Solution:

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