Per NCERT §5.8, the principle of CONSERVATION OF MECHANICAL ENERGY holds when which condition is satisfied?
AOnly conservative forces are acting
BNet force on the body is zero
COnly normal contact forces act
DFriction is present in the system
Answer & Solution
Correct answer: A. Only conservative forces are acting
NCERT §5.8: K + V = E_total is constant when only conservative forces act (no friction, viscous, etc).
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