Answer
$2.94J$
Work Step by Step
Difference in gravitational potential energy (PE)
$=\Delta(mgh)=1\times9.8\times1.2-1\times9.8\times0.9=2.94J$
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 5 - Work and Energy - Learning Path Questions and Exercises - Exercises - Page 176: 37
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