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<p>I don’t believe friction does any work. Since the ball is rolling without slipping, there is only static friction. (<------ right? wrong?)</p>
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<p>And thank you for making me realize I made a second horrible mistake on this test. I said in another thread somewhere that I wasn’t even reading the questions closely through the whole test and that it didn’t hurt me in the end. Wow, was I wrong - I thought it said “wagon and ball” - I guess all I saw was “wagon and b”. I didn’t even realize there was a box on this truck. That makes an error in the page 1 answers.</p>