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WARRIOR [948]
3 years ago
7

You lift a 10-N physics book up in the air a distance of 1.0 m, at a constant velocity

Physics
1 answer:
Anarel [89]3 years ago
5 0

The book is lifted upward, but gravity points down, so the work done by gravity must be negative (so you can eliminate options 1 and 3).

The force exerted on the book by gravity has magnitude

<em>F</em> = <em>mg</em> = (10 N) (9.80 m/s^2) = 9.8 N ≈ 10 N

You raise the book 1.0 m in the opposite direction, so the work done is

<em>W</em> = (10 N) (-1.0 m) = -10 J

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