1. At the highest point kinetic energy is minimn/maximuon while the potential en
ID: 1784694 • Letter: 1
Question
1. At the highest point kinetic energy is minimn/maximuon while the potential energy is minimum/maximum. 4 pts 2. At the lowest point kinetic energy is minimuan 3. Mass affects/ does not affect the conservation of energy. 2 pts How much potential energy does the 60 kg skater have before she starts her ride, 12 m above the ground? 2 pts /mcaxcimion while potential energy is minimn /maximm. 4 pts 72003 5. How much kinetic energy does a 60.0 kg skater have traveling with a velocity of 4m/s? 2 pts 480J] How fast must a 20. 0 kg skater travel to have a kinetic energy of 360 Joules? 16 m/s] 6. 2 pts 7. How high must a 2 0 kg basketball be thrown so it has a potential energy of 160 3? 2 pts 18 m/s 8. How fast must the 2.0 kg basketball be thrown upward to achieve the same potential energy of 160 J? 2 pts 12.6491 m/s] 9. A 75 kg skater starts his skate with an initial speed of 0.0 m's, 8.0m above the ground Just before he reaches the 2 pts ground what will be his velocity? 12.6491 m/s] 10. In the above question, all the potential energy became kinetic energy-Howch.mrkMadnetusmty? 2 Ps lAnswerl Page 4 of4Explanation / Answer
1)At the highest point velocity becomes zero.Thus kinetic energy will be zero (minimum) and potential energy will be maximum as h is maximum.
2)At the lowest point kinetic energy will be maximum and potential energy will be minimum as h is minimum.
3)One form of energy can be converted into another form of energy and the law of conservation of energy will be preserved. If the mass changes during that change, the law will still be preserved because other factors that determine the energy prior to, and after the change, will alter to preserve the validity of that law.
10)Work done by gravity=mgh
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