Work done against resistive forces by comparing Ek and work done

[g9WfI]

Homework Statement

A car of mass 900kg accelerates from 0 to 26.8 m/s in 9.2 s. The thrust from the engine is constant at 3500 N during this period. By comparing the kinetic energy gained by the car with the total work done by the engine, calculate the work done against resistive forces.

Relevant Equations

suvat, kinetic energy, work done

Missed units in the photo - J

Answer is 110 000 J

 

[Steve4Physics]

Homework Statement:: A car of mass 900kg accelerates from 0 to 26.8 m/s in 9.2 s. The thrust from the engine is constant at 3500 N during this period. By comparing the kinetic energy gained by the car with the total work done by the engine, calculate the work done against resistive forces.
Relevant Equations:: suvat, kinetic energy, work done

View attachment 284260
Missed units in the photo - J

Answer is 110 000 J

3500 * 123.48 = 431480, not 43300

 

[g9WfI]

3500 * 123.48 = 431480, not 43300

Thank you so much!