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Twelfth Grade (Grade 12) Energy and Momentum Questions

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Grade 12 Energy and Momentum
A 55 kg person walks up a staircase, and a second 55 kg person runs up the staircase. Who develops more power and why?
  1. the person who walks up because he takes more time, using more energy
  2. the person who runs up because he takes less time
  3. same power for both because both cover the same distance with the same force
  4. not enough information to determine
Grade 12 Energy and Momentum
Grade 12 Energy and Momentum
A force applied to a body is said to do "work"
  1. if the body is displaced in the direction of the applied force.
  2. if the body is displaced in the direction opposite to the applied force.
  3. even if the body does not move.
  4. only when the body is moving.
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