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1 August, 19:24

20-kilogram canoe is floating downriver at 2 m/s. what's the kinetic energy?

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Answers (2)
  1. 1 August, 19:27
    0
    To a physicist floating next to it in another canoe, its KE is zero.

    To a physicist standing on the riverbank watching it go by, its KE is 40J.

    They're both correct for their own reference frame.
  2. 1 August, 19:49
    0
    40J

    Explanation:

    Kinetic energy = 1/2 mv^2

    Where m = mass and

    v = velocity

    Given mass = 20kg

    v = 2m/s

    K. E = 1/2 x 20 x2^2

    = 1/2 x 20 x 2 x 2

    = 80/2

    = 40J
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