Question

If you performed a work "W" on an object. No external forces are acting on you and the object, while doing this work. Which of the following can be true

• A. Work done by the object on you is "-W"
• B. Work done on you is "-W"
• C. Work done by the object is "-W"
• D. Work done by you is "W"

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A

Work done by the object on you is "-W"

B

Work done on you is "-W"

C

Work done by the object is "-W"

D

Work done by you is "W"

When no other forces are acting, you and the object apply equal and opposite forces on each other. Since the displacement is same for both, work done will be equal in magnitude but opposite in sign.