The state of motion of a body is described by its ______and direction of motion.

Options

A. force
B. pressure
C. speed
D. none of these.

Explanation

To solve the question, "The state of motion of a body is described by its ______ and direction of motion," we need to analyze the options provided and understand the concepts involved.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks what describes the state of motion of a body. The state of motion includes not just whether the body is moving or at rest, but also how fast it is moving and in which direction.

2. **Analyzing the Options**:
- **Option 1: Force** - Force is a push or pull on an object but does not describe the state of motion directly. It influences motion but does not define it.
- **Option 2: Pressure** - Pressure is defined as force per unit area and does not relate to the state of motion of a body.
- **Option 3: Speed** - Speed is a measure of how fast an object is moving. It is a crucial component in describing the state of motion.
- **Option 4: None of these** - This option suggests that none of the previous options are correct.

3. **Identifying the Correct Answer**: Since the state of motion is described by how fast (speed) and in which direction an object is moving, the most appropriate answer is **speed**.

4. **Final Answer**: The state of motion of a body is described by its **speed** and direction of motion.