Work Energy And Power Question 13
Question: Assertion : According to law of conservation of mechanical energy change in potential energy is equal and opposite to the change in kinetic energy. Reason : Mechanical energy is not a conserved quantity.
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: C
Solution:
For conservative forces the sum of kinetic and potential energies at any point remains constant throughout the motion.
This is known as law of conservation of mechanical energy.
According to this law, Kinetic energy + Potential energy = constant or, $ \Delta K+\Delta U=0 $ or, $ \Delta K=-\Delta U $
