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The piston is pushed back in and the gas is compressed. That same work is now counted as:
APositive now
BZero as ever
CDoubled now
DNegative now
Answer & Solution
Correct answer: D. Negative now
1. Work is now being done on the gas rather than by it.
2. The sign convention flips accordingly.
3. Work done by the gas is negative now.
_Source: OpenStax University Physics Volume 2, Chapter 3, The First Law of Thermodynamics._
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