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7 An object of mass 2.00 kg starts at rest from the top of a tough inclned plane of height 20.0 m. If the work done by the force of friction as-150 3, what is the speed of the object as it reaches the botiom of the inclined plane? Use g- 1o.0 m/s A) 15.8 m B) 150 ros C) 12 2 ms D) 19 8 ms E) 21.2 ms S. The posential energy for a certain mass moving in one dimensaon s given by tlex) -(203m3)x-(15 m2) G6 m)x -23 Find the location(s) where the force on the mass is zero A) 4.0 m, 1.0m B) (3.25-0968i) m, (3.25+0.9681) m E) 3.0m, 50m C) 1 00 m, -1.00m D) 2.0 m, 3.00m 9 At what rate is a 60 0-kg boy ising energy when he nins up a flight of stars 100-m ¡ugh, in 8.00 s? A) 800 W B) 75 0 W ) 735.0 Vw D) 490 W E)480 W

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