A rocket works on the

Options

A. first law of motion
B. second law of motion
C. third law of motion
D. law of conservation of energy

Explanation

To solve the question "A rocket works on the", we need to analyze the principles of motion that apply to a rocket's operation. Here’s a step-by-step breakdown of the reasoning:

### Step 1: Understanding the Laws of Motion
We need to review Newton's three laws of motion:
- **First Law**: An object at rest stays at rest, and an object in motion stays in motion unless acted upon by an external force.
- **Second Law**: The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F = ma).
- **Third Law**: For every action, there is an equal and opposite reaction.

### Step 2: Analyzing Rocket Propulsion
When a rocket launches, it expels gas downwards at high speed. This action creates a reaction force that propels the rocket upwards.

### Step 3: Identifying the Relevant Law
The principle that describes this action and reaction is Newton's Third Law of Motion. The rocket's engines push exhaust gases downwards (action), and as a result, the rocket is pushed upwards (reaction).

### Step 4: Conclusion
Since the operation of a rocket is based on the action-reaction principle, we conclude that a rocket works on the **Third Law of Motion**.

### Final Answer
The correct answer is **Option 3: Third Law of Motion**.

---