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University Physics with Modern Physics with Mastering Physics (11th Edition)

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6.9: a) (i) Tension force is always perpendicular to the displacement and does no work. (ii) Work done by gravity is ). ( 1 2 y y mg - - When 2 1 y y = , 0 = mg W . b) (i) Tension does no work. (ii) Let l be the length of the string.
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Unformatted text preview: J 1 . 25 ) 2 ( ) ( 1 2-=-=--= l mg y y mg W mg The displacement is upward and the gravity force is downward, so it does negative work....
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