A : If m and `m_(e)` are moving mass, rest mass of a body and c is velocity of light, then kinetic energy of the body is `E=(m-m_(0))c^(2)`
R : Total energy of a body is sum of kinetic energy and rest mass energy.

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 false statements, then mark (4).

Answer

To solve the question, we need to analyze the two statements provided:

**Statement A**: The formula for kinetic energy is given as \( E = (m - m_0)c^2 \), where \( m \) is the moving mass and \( m_0 \) is the rest mass of the body.

**Statement R**: The total energy of a body is the sum of kinetic energy and rest mass energy.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- \( m \): Moving mass (also referred to as relativistic mass).
- \( m_0 \): Rest mass of the body.
- \( c \): Speed of light in a vacuum.

2. **Kinetic Energy in Relativity**:
- In the context of special relativity, the total energy \( E \) of a body is given by the equation:
\[ E = mc^2 \]
- The rest mass energy is given by:
\[ E_0 = m_0c^2 \]
- The kinetic energy \( K \) can be derived from the total energy by subtracting the rest mass energy:
\[ K = E - E_0 = mc^2 - m_0c^2 \]
- This simplifies to:
\[ K = (m - m_0)c^2 \]
- Hence, the formula \( E = (m - m_0)c^2 \) is indeed the expression for kinetic energy.

3. **Evaluating Statement A**:
- Since we derived that \( K = (m - m_0)c^2 \), Statement A is **correct**.

4. **Evaluating Statement R**:
- The total energy \( E \) of the body is the sum of kinetic energy \( K \) and rest mass energy \( E_0 \):
\[ E = K + E_0 \]
- Substituting the expressions we have:
\[ E = (m - m_0)c^2 + m_0c^2 = mc^2 \]
- This confirms that Statement R is also **correct**.

5. **Conclusion**:
- Both statements A and R are correct.

### Final Answer:
Both statements A and R are correct.