Question

A force  = 8 î − 3 ĵ N

 acts on a particle that undergoes a displacement Δ = 2 î + ĵ m.

(a) Find the work done by the force on the particle.

Answer 1

$W=(\vec F\cdot \vec r)=(8\vec i-3\vec j)(2\vec i+\vec j)=13\ (J)$ . Answer