Joule x second is the unit of

Options

A. Energy
B. momentum
C. angular momentum
D. power

Explanation

To determine what the unit "Joule x second" represents, we will analyze the units associated with the given options: energy, momentum, angular momentum, and power.

### Step-by-Step Solution:

1. **Identify the Units of Each Option**:
- **Energy**: The unit of energy is Joule (J).
- **Momentum**: The unit of momentum is kilogram meter per second (kg·m/s).
- **Angular Momentum**: The unit of angular momentum is kilogram meter squared per second (kg·m²/s) or can also be expressed as Joule x second (J·s).
- **Power**: The unit of power is Watt (W), which is equivalent to Joules per second (J/s).

2. **Analyze the Given Unit**:
- The unit in question is Joule x second (J·s).

3. **Compare with the Units of Each Option**:
- **Energy (J)**: This does not match since it is only Joule.
- **Momentum (kg·m/s)**: This does not match either.
- **Angular Momentum (kg·m²/s or J·s)**: This matches because angular momentum can be expressed as Joule x second.
- **Power (W or J/s)**: This does not match since it is Joules per second.

4. **Conclusion**:
- Based on the analysis, the unit "Joule x second" corresponds to the unit of angular momentum.

### Final Answer:
Joule x second is the unit of **angular momentum**.

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