In a party game, an apple is attached to a spring hung from a fixed support. A science student notices that the apple can be set into vertical oscillation of amplitude 10 cmn. The apple performs simple harmonic motion with a frequency of 0.625 Hz a] Write an equation describing the variation of displacement with time t for this particular system assuming that the apple is pulled to B and then released at time : - 0. (3 marks) b] Calculate the maximum velocity of the 500g apple as it oscillates. (2 marks)