The work done on a car?

A

asal

New member
A 950 kg car is stopped after rolling 12 m horizontally by pushing against the front with a force of 125 N directed 15 degrees below the horizontal. The frictional force acting on this auto has a coefficient of of kinetic friction of 0.07. calculate the work done by each of the four forces on this car.
 
Wf = -Ff*x = -µ*m*g*x = .07*950*9.8*12 = -7820.4 J

Wa = -Fa*cosΘ*x = -125*cos15°*12 = -1488.9 J

What the other 2 forces are is somewhat of a mystery to me....
 
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