Assertion : Work-energy theorem can be applied for non-inertial frames also.
Reason : Earth is a non-inertial frame.

Options

A. If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
B. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion.
C. If Assertion is true, but the Reason is false
D. If Assertion is false but the Reason is true.

Answer

To solve the given question, we need to analyze the assertion and the reason provided:

**Assertion:** Work-energy theorem can be applied for non-inertial frames also.
**Reason:** Earth is a non-inertial frame.

### Step-by-Step Solution:

1. **Understanding the Work-Energy Theorem:**
The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy. This theorem is generally applicable in inertial frames of reference.

**Hint:** Recall the definition of the work-energy theorem and its application in inertial frames.

2. **Non-Inertial Frames:**
A non-inertial frame is one that is accelerating or rotating. In such frames, fictitious or pseudo-forces must be considered to apply Newton's laws of motion.

**Hint:** Identify what makes a frame non-inertial and the implications of that on the application of physical laws.

3. **Application of the Work-Energy Theorem in Non-Inertial Frames:**
The work-energy theorem can still be applied in non-inertial frames by introducing pseudo-forces. When analyzing motion in a non-inertial frame, we can account for these pseudo-forces to effectively treat the frame as inertial for the purposes of applying the work-energy theorem.

**Hint:** Think about how pseudo-forces can modify the dynamics in a non-inertial frame.

4. **Analyzing the Reason:**
The Earth is often considered a non-inertial frame due to its rotation and the effects of gravity. However, for many practical problems, we treat it as an inertial frame because the effects of its non-inertial nature are negligible.

**Hint:** Consider the implications of Earth's rotation and gravity on the motion of objects.

5. **Conclusion:**
- The assertion is true: The work-energy theorem can indeed be applied in non-inertial frames by considering pseudo-forces.
- The reason is also true: Earth is a non-inertial frame.
- However, the reason does not correctly explain the assertion because simply stating that Earth is a non-inertial frame does not clarify why the work-energy theorem can be applied in such frames.

### Final Answer:
Both the assertion and reason are true, but the reason does not provide a correct explanation for the assertion. Therefore, the correct choice would be that both statements are true, but the reason is not a correct explanation of the assertion.