(a) Figure Q2 shows a man accidentally drop a pebble after he stabilized it on a semi- circular ram. The mass of the pebble is 0.2 kg starts from rest at point A and slides down the smooth surface of the ram to point B. where the e- 30. i. How much is the work done by the pebble as it starts from point A to point B? (6 marks) ii. Using conservation of energy, find the magnitude of the pebble's velocity at point B. (6 marks] Figure Q2(a) (b) A newly design car is put to a safety test for its energy absorbing bumper capability. The car has a mass of 1270 kg shown in Figure 2(b) is driven to the barrier with the speed of 8 km/h and it bounces back with from the barrier at 1.6 km/h. The duration of the impact is 0.4 s. i. How much is the impulsive force on the car during the impact? (7 marks) ii. What is the deceleration of the car after the impact? 16 marks] Figure 2(b)