Question

Assertion :If work done by conservative forces is positive, kinetic energy will increase. Reason: Because potential energy will decrease

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Potential energy is the amount of work that the force due to the position of the body

$W=mgh$

The change in kinetic energy is given as

$\Delta K.E.=W_{ext}$

$\Delta K.E.=W_{con}+W_{non-con}$

$\Delta K.E.=-P.E.+W_{non-con}$

$\Delta K.E.+P.E.=W_{non-con}$

So if the work done by the potential energy is positive that means the system is doing work and hence the kinetic energy will increase.

Hence, both the assertion and reason are correct.