d) Forces of magnitude F_{I} =2 hat i -5 hat j +6 hat k , F 2 = - i +2 hat j - hat k and F_{3} =2 hat i +7 hat j acts on a particle P whose position vector is given by 4 hat i -3 hat j -2 hat k . Find the work done by the force in displace of the particle to the point O(6, 1, - 3)