I am using College Physics by Wilson, 4th edition. The book poses the following

Question

I am using College Physics by Wilson, 4th edition.

The book poses the following question on page 140:

How much work is done on a 0.20-kilogram ball by gravity as theball rises between heights of 2.0 meters and 3.0 meters?

Using the formula W = Fd cos<<theta>> and F = mg, and seeing thatthe force and displacement vectors are 180 degrees opposite of eachother, I would think the answer would be:

              F = 0.20kg * 9.8 m/s2 = 1.96kgm/s2
              W = 1.96 kgm/s2 * 1m = 1.96 J or 2.0 J

The book provides an answer of 20 J. Why am I off by a factorof 10?

Explanation / Answer

What you have done is totally correct. I think there is a typo either in the question or answer.

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