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For part A. the formula i figured I use is = Mgd cos 180

= (.33kg)(-9.8)(.11m) cos 180 (which is -1)

= 0.39 J

For part B. I was using the formula = - 1/2Kx^2

however I ran into some either arithmatic problems or technique. here is my work.

= -(1/2)(330N/m)(.11m)^2

= -18.15 J

But im thinking there is a problem since the answer is incorrect.

For part C. I used the formula = 1/2mv^2 = Wnet = Wg +Wa

Wg = mgd and Wa = mk

so ultimately after reworking the formula, it became

v = Square root (gd + k) times 2

My question is... is the 2 included under the square root? or outside?

Not exactly sure where i went wrong, because the answer is incorrect.

For part D. i used d = v times square root (m/k)

but since part C is incorrect, this answer is also wrong. (or maybe the formula is too?)

Can someone help me understand where i made my mistakes. Thanks!