# Chapter 7 - Think and Solve: 44

9000 J.

#### Work Step by Step

The total energy of 10,000 J remains the same. $$PE + KE = Total \;E$$ $$1000 J + KE = 10,000 J$$ $$KE = 10,000 J – 1000 J = 9000 J$$ This situation is discussed on page 118.

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