A body has an acceleration of `-4ms^(-2)`. What is its retardation?

Options

A. `-4ms^(2)`
B. `4ms^(-2)`
C. Zero
D. nothing can be decided

Answer

To solve the question regarding the retardation of a body with an acceleration of `-4 m/s²`, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Acceleration**:
- The given acceleration is `-4 m/s²`. The negative sign indicates that the acceleration is in the opposite direction to the velocity of the body.

2. **Defining Retardation**:
- Retardation is defined as negative acceleration that causes a decrease in the velocity of an object. It is essentially the magnitude of acceleration when it is acting in the opposite direction to the motion.

3. **Magnitude of Retardation**:
- Since retardation is the magnitude of the negative acceleration, we can express it as the absolute value of the acceleration. Therefore, the retardation can be calculated as:
\[ \text{Retardation} = |\text{Acceleration}| \]
- Substituting the value of acceleration:
\[ \text{Retardation} = |-4 m/s²| = 4 m/s² \]

4. **Final Answer**:
- Thus, the retardation of the body is `4 m/s²`.

### Summary:
- The body has a retardation of `4 m/s²`.