Find the work done by the force F = 3i − 7j in moving an object from the point (8, 7) to the point (9, −15).

Question

Find the work done by the force F = 3i − 7j in moving an object from the point (8, 7)

 to the point (9, −15).

Answer 1

Displacement vector S = <9 - 8, - 15 - 7> = <1, - 22>

Work W = F•S = 3·1 + (- 7)(- 22> = 157