41. During a game of billiards, the 300 g cue ball, travelling at 2.1 m/s, glances off a stationary 280 g billiard ball so that the billiard ball moves off at 1.4 m/s at an angle of 380 from the cue ball's original path. Find the new speed of the cue ball. [3 marks] 42. Calculate the electric potential a distance 5.6 x 104 km from a point charge of -3.6 x 10 4C. [3 marks]