Question

These questions consist of two statements each, printed as Assertion and Reason. While answering these Questions you are required to choose any one of the following four responses.

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are False.
Assertion :- A body may gain kinetic energy and potential energy simultaneously.
Reason :- Conservation of mechanical energy may not be valid every time.
(1) A (2) B (3) C (4) D

Answer 1

Answer on Question #42348-Physics-Mechanics-Kinematics

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.

B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.

C. If Assertion is True but the Reason is False.

D. If both Assertion & Reason are False.

Assertion :- A body may gain kinetic energy and potential energy simultaneously.

Reason :- Conservation of mechanical energy may not be valid every time.

(1) A (2) B (3) C (4) D

Solution

Assertion is True: A body may gain kinetic energy and potential energy simultaneously. Whenever work is done upon a body by an external force (or nonconservative force), there will be a change in the total mechanical energy of the object. Thus kinetic energy and potential energy can increase simultaneously.

Reason are False: Conservation of mechanical energy may not be valid in presence an external forces (or nonconservative forces).

Answer: (3) C.

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