Question

A car of mass 750 kg accelerates away from
traffic lights. At the end of the first 100 m
it has reached a speed of 12 m/s. During this
time, its engine provides an average forward
force of 780 N, and the average force of
friction on the car is 240 N.
a Calculate the work done on the car
by the force of its engine.
b Calculate the work done on the car
by the force of friction.
c Using k.e. = 1 mv?, calculate the
increase in the car's kinetic energy
at the end of the first 100 m.
d Explain whether your answers are
consistent with the principle of
conservation of energy.

Answer 1

I don't know

I don't know