What kind of work does a car engine do on a path of 80 m, developing a traction force of 6.5 kN.

F = 6.5 kN = 6500 N.
S = 80 m.
A – ?
Mechanical work is determined by the formula: A = F * S * cosα, where F is the force that acts on the body, S is the movement of the body, ∠α is the angle between the direction F and S.
∠α = 0, cos0 = 1, then the mechanical work A will be determined by the formula: A = F * S.
A = 6500 N * 80 m = 520000 J.
Answer: the car is doing work A = 520000 J.