Physics question?

Question

The non-conservative force propelling a 1500kg car up a
mountain does 4700000 J of work on the car. The car starts from rest at sea level and has a speed of 27m/s at 200 m above sea level. Obtain the work done on the car by the combined forces of ar resistance and friction, both of which are nonconservative forces.

Answer 1

The final kinetic energy of the car
.5*m*v^2
plus the increase in potential energy of the car
m*g*h
equals the energy input
4700000
less the work done by friction and air resistance, f
so
f=4700000-
1500*(27^2/2+9.81*200)

f=1210250 J

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