Chapter 7, Problem 70P

A force $\stackrel{\to }{F}$= (4.0 N) $\hat{i}$ + c $\hat{j}$ acts on a particle as the particle goes through displacement $\stackrel{\to }{d}$= (3.0 m)î − (2.0 m) $\hat{j}$. (Other forces also act on the particle.) What is c if the work done on the particle by force $\stackrel{\to }{F}$ is (a) 0, (b) 17 J, and (c) −18 J?