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physics

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A person pushes a 16.0-kg shopping cart at a constant velocity for a distance of 20.0 m. She pushes in a direction 28.0° below the horizontal. A 54.0-N frictional force opposes the motion of the cart.

  • physics -

    Wc = m * g = 16kg * 9.8N/kg = 156.8 N. = Wt. of the cart.

    Fe*cos28-Ff = m*a
    0.8829Fe - 54 = m*0 = 0
    0.8829Fe = 54
    Fe = 61.2 N. = Force exerted.

    W = Fe*cos28 * d
    W = 61.2*cos28 * 20 = 1080 Joules = Work
    done on cart.

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