In this question, a statement of assertion is followed by …

Physics Work, Energy, Power and Collision Assertion & Reason MCQ (Single Correct)

In this question, a statement of assertion is followed by a statement of reason . Mark the correct choice as:

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.

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If assertion is false but reason is true.

Text Solution

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The correct answer is:

For conservative forces the sum of kinetic and potential energies at any point remains constant

throughout the motion. It does not depend upon time. This is known as law of conservation of mechanical energy. According to this rule,
Kinetic energy + Potential energy constant

or, or,

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