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Homework Statement
http://xs511.xs.to/xs511/07046/workenergy.JPG
Homework Equations
The Attempt at a Solution
Ok I am all confused on this one.
ok so leave part (I) and (II)
onto part (III)
word done by the pulling force acting on the block = the loss of energy + work done by resisting force
by loss of energy i mean gain in PE - loss in KE
=(7500+225)-(1225)+(7.5 x 200) = 8000J
now I am confused as to whether or not the value of theta is mgsintheta or fscostheta please help
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