Homework Help: physics

Posted by Juliette on Monday, October 4, 2010 at 7:23pm.

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.

Help!

physics - Anonymous, Wednesday, March 9, 2011 at 10:01pm
gravity is doing no work because its perpendicular to the motion

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