Potential and Kinetic Energy

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  • Please be quiet, Princess!
  • zzzz...
  • Help me!
  • 
  • Potential Energy: 0.6 Joules
  • 
  • Kinetic Energy: 12000 Joules
  • zzz...
  • There is a princess stuck in a tower. To escape, her plan is to dive into the small pond next to her tower. One guard is awake, but after a tireless day, he is bound to fall asleep soon. She wants to calculate her potential and kinetic energy.
  • Her height from the top of the tower to the water is 100 meters, and she weighs about 60 kg. To calculate her potential energy, her weight and height are divided. The quotient is 0.6, so her potential is 0.6 Joules.
  • After the last guard fell asleep, she executed her plan. It took her about 5 seconds to land in the water. Kinetic energy is calculated by multiplying mass by speed squared and dividing the product by 2. Speed is calculated by dividing distance and time, so her speed is about 20 m per second. Her mass of 60 k is multiplied by her speed of 20 squared and divided by 2. Her kinetic energy is 12000 Joules.
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