A car of mass $$$1800 \mathrm{~kg}$$$ is travelling along a straight horizontal road. The power of the car's engine is constant. There is a constant resistance to motion of $$$650 \mathrm{~N}$$$. Find the steady speed which the car can maintain with the engine working at this power. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................

Mathematics

IGCSE&ALevel

CAIE

Exam No：9709_w20_qp_42 Year：2020 Question No：2(b)

Answer:

$\frac{31000}{v}-650=0$
$v=47.7 \mathrm{~ms}^{-1}$

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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