A 98.0-N sack of grain is hoisted to a storage room 50.0 m above the ground floor of a grain elevator. a. How much work was done? b. What is the increase in potential energy of a system containing the sack of grain and Earth? c. The rope being used to lift the sack of grain breaks just as the sack reaches the storage room. What kinetic energy does the sack have just before it strikes the ground floor?
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73. A 98.0-N sack of grain is hoisted to a storage room 50.0 m above the ground floor of a grain elevator. a. How much work was done? b. What is the increase in potential energy of the sack of grain at this height? c. The rope being used to lift the sack of grain breaks just as the sack reaches the storage room. What kinetic energy does the sack have just before it strikes the ground floor?
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A $98.0-\mathrm{N}$ sack of grain is hoisted to a storage room $50.0 \mathrm{m}$ above the ground floor of a grain elevator. a. How much work was done? b. What is the increase in potential energy of the sack of grain at this height? c. The rope being used to lift the sack of grain breaks just as the sack reaches the storage room. What kinetic energy does the sack have just before it strikes the ground floor?
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A mass resting on a shelf $10.0$ meters above the floor has a gravitational potential energy of 980 . joules with respect to the floor. The mass is moved to a shelf $8 .$ oo meters above the floor. What is the new gravitational potential energy of the mass? (A) $960 . \mathrm{J}$ (B) $784 \mathrm{~J}$ (C) $490 . \mathrm{J}$ (D) $196 \mathrm{~J}$
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