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A book was dropped from a height of 4.2 meters has 109 joules of potential energy. What is the mass of the book? (I have 6 more problems so please stick around to help if you can!)
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35 votes
A book was dropped from a height of 4.2 meters has 109 joules of potential energy. What is the mass of the book?

(I have 6 more problems so please stick around to help if you can!)

User Andrewmabbott
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1 Answer

16 votes
16 votes

Answer:


P.E=mgh \\ 109 = m(9.81)(4.2) \\ m = (109)/(9.81 * 4.2) \\ \boxed{m = 2.6455 \: kg}

User Jack Daniel
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