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13 March, 19:29

An initially stationary 1.3 kg object accelerates horizontally and uniformly to a speed of 9.4 m/s in 3.0 s. (a) In that 3.0 s interval, how much work is done on the object by the force accelerating it

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  1. 13 March, 19:41
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    Answer: 57.434 Nm

    Explanation: mass of object = 1.3kg, initial speed = 0m/s (since it was at rest), final speed = 9.4 m/s.

    Using the work energy theorem,

    The work done on the object equals it kinetic energy.

    Work done = mv²/2

    Work done = 1.3 * (9.4 - 0) ²/2

    Work done = 1.3 * 9.4² / 2

    Work done = 114.868 / 2 = 57.434 Nm
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