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Item 19 A student pushes a box across a rough horizontal floor. If the amount of work done by the student on the box is 100 J and the amount of energy dissipated by friction is 40 J, what is the change in kinetic energy of the box

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  1. 3 May, 21:29
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    60 J

    Explanation:

    Given,

    Work done to push the box = 100 J

    Energy dissipated by friction = 40 J.

    According to work energy theorem work done is equal to change in kinetic energy.

    Change in Kinetic energy = Work done by student + Work done by friction

    Change in Kinetic energy = 100 J - 40 J

    Work done by the friction will be negative because it will act in opposite direction of force applied.

    Change in Kinetic energy = 60 J
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