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Unformatted text preview: Newtons 2 nd law yields M(-g/4) = T Mg T = 3Mg/4 = 58.8 N In our coordinate system, the displacement of the block is d. Thus the work done by the tension is W T = T(-d) = -147 J b) When the block has fallen the distance d = 2.50m, what is the kinetic energy of the block? The net force exerted on the block is F net = M(-g/4) = -19.6 N According to the work-energy theorem, the change in kinetic energy of the block is equal to the work done by the net force. Since the initial kinetic energy is zero, the kinetic energy of the block is K = W net = F net (-d) = +49 J...
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This note was uploaded on 01/25/2011 for the course PHY 2048 taught by Professor Field during the Summer '08 term at University of Florida.
- Summer '08