(a) Describe the differences between the equations of motion and principle of work and energy in kinetics analysis of rigid bodies. (b) At the instant shown in Figure Q3(b) the 4-kg collar is released from rest at point B and slides down on the smooth inclined rod of 0 = 60. The slider is attached to two springs of equal undeformed length of 1.2 m and each is of stiffness 500 N/m. The mechanism is in vertical plane. As the collar passes point C, (i) (ii) (iii) determine the velocity of the collar, draw the free body diagram and the kinetics diagram, and determine the force exerted by the rod on the collar. (c) If greater spring stiffness is used while the undeformed length remains the same, evaluate the speed of the collar at point C. 0.8 m www. [H B 0.8 m www 0 C Figure 03(b) 0.6 m