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27 March, 21:18

A defensive tackle picks up the 0.5kg football to a height of 0.8m in 0.25s ... 1. calculate the work done 2. calculate the power generated

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  1. 27 March, 21:43
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    1). The work done is the potential energy the football has after it is raised.

    Weight of the football = (Mass) x (gravity) = (0.5) x (9.8) = 4.9 newtons

    Work = (force) x (distance) = (4.9 newtons) x (0.8 meter) = 3.92 joules

    2). Power = (work) / (time) (You know this from the car problem.)

    Power = (3.92 joules) / 0.25 s) = 15.68 joules per second = 15.68 watts.
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