can anyone help me on the second question? i found the part a is 1400 * 0.1 m = 140N, part b is 6.6m, part c is 14J, part d is but i don't know how to do the last two part.... help please!! is this correct? w=mgcos60 x 6.6m = 6.468 J.. i don't know which distance should i use~ 0.1m or 6.6m? 0.1m is form the spring and 6.6 is the total distance.. how to find the maximum kinetic and potential energy of the block?