A piece of fruit falls straight down. As it falls,
A. the gravitational force does positive work on it and the gravitational potential energy increases.
B. the gravitational force does positive work on it and the gravitational potential energy decreases.
C. the gravitational force does negative work on it and the gravitational potential energy increases.
D. the gravitational force does negative work on it and the gravitational potential energy decreases.
E. answer depends on whether or not air resistance is present.
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