Review time; came across that question in the text....I DON'T KNOW!
...i hate this class.
what is the total work done on a block sliding up a frictionless plane?
Is the block slowing down or speeding up?
What does the work-energy theorem say?
block would be slowing down right, if it's going up?
work-energy thm. says W= change in kinetic energy....
It's negative, because the projection of the force of gravity on the displacement up the ramp is in the opposite direction.
exactly... so since it is slowing down... change in kinetic energy is negative... so work done on the block is negative.
ok. i think i get it.
thanks guys! :]
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