Which of the following statements about the conservation of mechanical energy is…
PHYSICS · Single correct · CBSE · Physics · Work, Energy and Power · Work, Energy and Power
Problem
Which of the following statements about the conservation of mechanical energy is correct for an isolated system?
(a) Mechanical energy is always conserved in an isolated system because energy cannot be created or destroyed.
(b) Mechanical energy remains constant only in the absence of any external conservative force such as gravity.
(c) Mechanical energy remains constant when the forces doing work are all conservative.
(d) Mechanical energy remains constant provided the net external force on the system is zero, irrespective of whether the forces are conservative or not.