Please could you explain how you got your answers in a mathematical way? 

Q52 Thinking physics We have covered three (closely interlinked) methods for solving mechanics problems: 1) Newton's laws 2) Work-energy theorem 3) Momentum conservation Which of the three approaches would be best suited to tackle the following scenarios. Justify your response (do not solve them!). a) Determining velocity reached by roller coaster on a track. b) Determining time taken for block to be pulled to top of track. c) Determining velocity of outgoing objects for collision on the right d) Determining dynamics of objects attached via pulleys u Initially m M H. m Finally 2m/u/2 m 36cm u m