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22 November, 23:05

A 2-kg bowling ball sits on top of a building that is 40 meters tall.

Circle one: KE / GPE / both

Show your work for finding the values of each type of energy the object has:

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Answers (1)
  1. 23 November, 00:40
    0
    Step-by-step explanation:

    1.

    The ball is not moving and is at a height above the ground so it has only potential energy.

    P. E = 2 x 9.81 x 40

    P. E = 784.8 J

    2.

    The ball is moving and has a height above the Earth's surface so it has both kinetic and potential energy.

    P. E = same as part 1 = 784.8 J

    K. E = 1/2 x 2 x 5²

    K. E = 25 J

    3.

    The ball has no height above the Earth's surface and is moving so it has only kinetic energy.

    K. E = 1/2 x 2 x 10²

    K. E = 100 J

    4.

    50000 = 1/2 x 1000 x v²

    v = 10 m/s

    5.

    39200 = 200 x 9.81 x h

    h = 20.0 m

    6.

    12.5 = 1/2 x 1 x v²

    v = 5 m/s

    98 = 1 x 9.81 x h

    h = 10.0 m
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