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HCS (Haryana)Prelims2026General Studies
Question
Consider the following statements: 1. An object moving with constant velocity has zero net force acting on it. 2. Action and reaction forces act on the same body. 3. A large force acting for a short time can produce a large change in momentum. How many of the statements given above are correct?
Options
- A Only one
- B Only two
- C All three
- D None
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Correct Answer
B Only two
Model Answer
- According to Newton's first law of motion, a body continues to move with a uniform velocity in a straight line unless acted upon by an unbalanced force. Therefore a body moving with constant velocity has zero acceleration and the net force on it is zero. Hence, statement 1 is correct.
- According to Newton's third law of motion, to every action there is an equal and opposite reaction, but the action and the reaction always act on two different bodies and never on the same body. That is why they do not cancel each other. Hence, statement 2 is incorrect.
- From the second law of motion, the impulse of a force is equal to the change in momentum, that is, F multiplied by t equals the change in momentum. A large force acting even for a short interval of time can therefore produce a large change in momentum. Hence, statement 3 is correct.
- Therefore, only two statements are correct.