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Newton's first law of motion is related to physical independence of force. Which of the following statements is correct?

1. If no net force acts on a body, then the velocity of the body cannot change i.e., the body cannot accelerate.
2. If no net force acts on a body, then the velocity of the body can change.
3. If no net force acts on a body, then the body cannot move.
4. If no net force acts on a body, then the body can accelerate.

Correct answer: If no net force acts on a body, then the velocity of the body cannot change i.e., the body cannot accelerate.

Solution

Newton's first law states that a body remains in its state of rest or uniform motion unless acted upon by a net external force. Thus, if no net force acts, the velocity remains constant, and the body cannot accelerate.

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