How much work is done by the force F⃗ =(− 3.0 i^− 7.6 j^)N on a particle that moves through displacement Δr⃗ = 3.6 i^−2.0j^m?

Answer 1

Fx dx + Fy dy

(-3 * 3.6) - (7.6 * -2)

4.4

Answer 2

F=<-3,-7.6>
Δr = <3.6,-2>

Work done
F.Δr
= <-3,-7.6><3.6,-2>
= 4.4 J