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      Question

      A body is thrown vertically upwards and then falls back

      on the ground. Its potential energy is maximum:
      A on the ground Correct Answer Incorrect Answer
      B at the maximum height Correct Answer Incorrect Answer
      C during the return journey Correct Answer Incorrect Answer
      D Both on the ground and at the maximum height Correct Answer Incorrect Answer

      Solution

      Potential energy is given by U=mgh, where h is the height above the ground. The potential energy is maximum at the maximum height because h is greatest at this point. On the ground, h=0, so the potential energy is zero.

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