A : Work done by the frictional force can’t be positive.
R : Frictional force is a conservative force.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
C. If Assertion is true statement but Reason is false, then mark (3).
D. If both Assertion and Reason are falsė statements, then mark (4).

Answer

To analyze the given statements, we need to evaluate both the assertion and the reason provided.

### Step 1: Evaluate the Assertion
The assertion states that "Work done by the frictional force can’t be positive."

- **Explanation**: The work done by a force is defined as the product of the force and the displacement in the direction of the force. In the case of friction, it typically opposes the direction of motion. However, there are scenarios where friction can do positive work. For example, if a block is on a surface and another block is pushed on top of it, the friction between the two blocks can cause the top block to accelerate in the direction of the applied force, thus doing positive work on it.

- **Conclusion**: Therefore, the assertion is **incorrect**.

### Step 2: Evaluate the Reason
The reason states that "Frictional force is a conservative force."

- **Explanation**: A conservative force is one where the work done is independent of the path taken and depends only on the initial and final positions. Friction, on the other hand, is path-dependent. The work done by friction can vary based on the path taken, which means it does not meet the criteria for being a conservative force.

- **Conclusion**: Therefore, the reason is also **incorrect**.

### Step 3: Final Conclusion
Since both the assertion and the reason are incorrect, the overall conclusion is that both statements are false.

### Answer
Both the assertion and the reason are incorrect.

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