a) In the figure below, a block slides from A to C along a smooth ramp and then it passes through the horizontal region CD, where a frictional force acts on it. (i) Briefly explain whether the kinetic energy of the block increases, decreases or remains constant in regions AB, BC and CD. (ii)Briefly explain whether the mechanical energy of the block increases, decreases or remains constant in regions AB, BC and CD. b) C D Three blocks are connected by strings as show below, and pulled by a force of T3=200 N across a rough floor. Determine the acceleration of the system and the values of T1 and T2. Take the force of friction between the surface of the floor and each block to be 1 N. (3 marks) T 5 kg 10 kg 15 kg T3 (6 marks)