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I wrote:
The first answer should be 6 mg (so that the net vertical force is 5
mg.) Then the others make sense to one sig fig.
Hmm, should'a waited another second on hitting that "send" button.
I see that the problem asked for the average vertical force in part
a, NOT the average force from the ground. So the answers are correct.
--
John Mallinckrodt mailto:ajm@csupomona.edu
Cal Poly Pomona http://www.csupomona.edu/~ajm