The work W done by a constant force F as its point of application moves along the vector PQ is given by W=F-PQ Find the work W done in moving a particle from point P(1,3) to Q(-3,5) when the magnitude and direction of the force are given by F = -21+3j. 12. 13) Find the angle 8 between the two vectors u = and v= . 13. 14) Determine whether u and v are orthogonal, parallel, or neither for u= and v= . 5) Find u xv for u= and v= 14. 15.