Question

A stretched rubber has [AIIMS 2000]
A) Increased kinetic energy B) Increased potential energy C) Decreased kinetic energy D) Decreased potential energy

Answer 1

Hello Dear.

Here is the answer---

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Answer ⇒ Option B. Increased Potential Energy.

Explanation ⇒ A Certain Amount of Work is done in Stretching the Rubber.
This Energy of the Performed work is stored in the Stretched Rubber. Thus, Potential Energy of the Rubber Increased.

⇒ For Option A. ⇒ It cannot be Correct, Since, there is no Movement of the Rubber, thus Kinetic Energy of the body is zero. Thus, there will be no increase in kinetic energy. 

⇒ For Option C. ⇒  It cannot be correct, since there is no Movement of the Rubber, thus Kinetic Energy of the Body is zero. Thus, there will be no decrease in Kinetic Energy.

⇒ For Option D. ⇒ It cannot  be correct.

Reason ⇒ The work is done in stretching the Rubber, which is stored in the form of the Potential Energy. Thus, the Potential Energy of the Body will be Increased, instead of decreasing. Thus, Option D. is Correct.


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Hope it helps.

Have a Good Day.   :-) 

Answer 2

Answer:

Option b is correct.

Explanation:

When we stretch a rubber, the potential energy of it increases becauseof intermolecular forces and hence it is released when the load is removed.