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7 September, 18:13

A 15,000lb freight car is pulled along a horizontal track.

Ifthe car starts from rest and attains a velocity of 40ft/s

aftertraveling a distance of 300ft.

determine the total work done on the car by the towing forcein

this distance if the rolling frictional force between the carand

the track is 80lb.

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  1. 7 September, 20:33
    0
    12024000 lb*ft

    Explanation:

    The total work will be the sum of the energy consumed by friction plus the kinetic energy the car attained.

    L = Ek + Lf

    Lf = Ff * d

    Ek = 1/2 * m * v^2

    Therefore:

    L = Ff * d + 1/2 * m * v^2

    L = 80 * 300 + 1/2 * 15000 * 40^2 = 12024000 lb*ft

    THe total work done on the car is of 12024000 lb*ft
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