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1 March, 16:30

Bonny Blair of the United States set a world record in speed skating when

she skated 5.00 x 10' m with an average speed of 12.92 m/s. Suppose

Blair crossed the finish line at this speed and then skated to a stop. If the

work done by friction over a certain distance was - 2830 J, what would

Blair's kinetic energy be, assuming her mass to be 55.0 kg.

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  1. 1 March, 16:47
    0
    4589.75J

    Step-by-step explanation:

    Kinetic energy = 1/2 x M x v^2

    Given

    Mass M = 55.0kg

    V = 12.92m/s

    Kinetic energy

    = 1/2 x 55.0 x (12.92) ^2

    = 1/2 x 55.0 x (12.92 x 12.92)

    = 1/2 x 55.0 x 166.9

    Multiply through

    = 9179.5/2

    = 4589.75J
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