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13 March, 22:20

A 200.0 kg piano is elevated by a crane to a height of 10.0 meters above a sidewalk. If the rope holding the piano breaks, what will the potential energy of the piano be when it has fallen 5.00 meters?

a) 0 J

b) 9,810 J

c) 10,000 J

d) 19,620 J

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Answers (1)
  1. 13 March, 23:37
    0
    All that business about the crane and the rope and the falling

    is only there to confuse us.

    The piano ended up 5 meters above the ground.

    Potential energy = (mass) (gravity) (height)

    = (200 kg) (9.81 m/s²) (5 m)

    = (200 · 9.81 · 5) (kg-m²/s²)

    = 9,810 joules.
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