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A shopper pushes a grocery cart 20m at constant speed on level ground against a 35N frictional force. He pushes in a direction 25 degrees below the horizontal. What is the work done on the cart by gravity?

I know you can use W=Fdcos(theta) where F=mass*gravity. BUT, no mass is given so there must be some other way.


  • physics -

    gravity is doing no work because its perpendicular to the motion

  • physics -

    mass is not required. Constant speed means zero acceleration.
    Fcos(theta) - Ff=m*a
    Fcos(theta) - Ff=0
    F cos(25) =35
    W= 38.62 cos(25)*20

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