104. We work this in SI units and convert to horsepower in the last step. Thus,
v
=
F
H
G
I
K
J
=
80
1000
3600
22 2
km h
mkm
sh
ms
bg
..
The force
F
P
needed to propel the car (of weight
w
and mass
m = w
/
g
) is found from
Newton’s second law:
FF
F
m
a
wa
g
P
net
=−
=
=
where
F
= 300 + 1.8
v
2
in SI units. Therefore, the power required is

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