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Question 4 a) Figure Q4 illustrates two objects which are travelling with the initial velocities shown just before they collide at point M. If the coefficient of restitution of the collision is 0.75, determine the resultant final velocities of each object immediately after the collision. [20 Marks) + Y axis Mass, MB = 8 kg Mass, MA = 10 kg B A U₁=6 m/s U₁=4 m/s 20% 100⁰ Point M X axis Figure Q4 b) A viscous fluid of dynamic viscosity 0.45 Ns/m² flows past a fixed boundary with laminar flow, v, varies with the distance, y from the boundary according to the velocity profile equation: v=sin(e) Calculate the viscous shear force in the fluid if the area is 1.5 m²: i) at the boundary wall (y=0). [3 Marks] ii) at y=0.1 m from the boundary wall. [2 marks] Note: angles in radians