Which one of the following statements is correct? |
i. Work and energy have different units. |
ii. When an aeroplane takes off, the work done by its weight is positive. |
iii. The potential energy of a spring increases when it is extended and decreases when it is compressed |
iv. When a body falls its kinetic energy remains constant. |
v. When negative work is done by external forces on a system, the energy of the system decreases. |
A) i, ii and iii
B) ii, iii and v
C) Only v
D) iii, iv and v
E) None of these
Correct Answer: C
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