2- An object, M = 2 kg on a frictionless horizontal surface was displaced along + x-axis by d = (4i) m while a force F = (8i + 6k) N was acting on the object. Here, i and k are the unit vectors along the x and z axis, respectively. (a) Find the work done by F on the object during the displacement. What is the scalar product, F . d? (b) If the object starts from rest, vi = 0, find its kinetic energy at the end of this displacement. What is the work done by the gravitational force during this displacement?