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26 January, 07:37

A shopper pushes a grocery cart for a distance of 18m at a constant speed on level ground, against a 37.5N frictional force. he pushes in a direction 27.5° below the horizontal.

what is the work done on the cart by gravitational force, in joules.

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  1. 26 January, 07:51
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    d = distance to which the grocery cart is pushed = 18 m

    f = frictional force = 37.5 N

    θ = angle of force below the horizontal = 27.5 deg

    W = gravitational force in downward direction

    Θ = angle between gravitational force in down direction and displacement in horizontal direction = 90

    U = work done on the cart by gravitational force

    work done on the cart by gravitational force is given as

    U = W d CosΘ

    inserting the values

    U = W (18) Cos90

    U = 0 J
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