A Simple Mechanics Problem: Help with Calculating Forces and Energy

[ken62310]

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?

 

[learningphysics]

Are you certain that the distance up the incline and the work by the spring that you calculated are right?

For the work by the spring... won't it just be (1/2)kx^2 = (1/2)(1400)(0.1)^2 = 7J ?

I'm assuming the spring is compressed at 0.1m and then released?