Question

1 25.
30. A
The sum of the kinetic and potential energies
system of objects is conserved
(1) Only when no external force acts on
system
(2) Only when the objects move along closed pat
(3) Only when the work done by the resultant
external force is zero
(4) Only when the objects move under the action
of a conservative force​

Answer 1

Answer:

1Only when no external force acts on it system