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Assertion: During the motion of a projectile, the horizontal component of velocity remains constant
Reason: The force acting on a projectile is gravity, acting in a downward vertical direction.
Assertion and reason both are correct and the reason is a correct interpretation of Assertion.
Both assertion and reason are correct but reason is not a correct interpretation of assertion
Assertion is correct but reason is incorrect.
Assertion is incorrect but reason is correct
Answers (1)
Answer: (A) Assertion and reason both are correct and reason is a correct interpretation of Assertion.
Explanation:
Forces are needed to change the state of an object, either to change it from rest to motion, to bring it to rest in motion or to change the speed of a moving particle.
If no external force acts on a particle, its state will not change according to the law of inertia.
So if it is at rest it will stay at rest, or if it has been moving at a certain speed it will always be moving with the same speed if no external force is acting on it.
In the case of projectile motion ignoring air resistance, the only force involved is gravity, and this force acts downwards, which means that the vertical component of the particle velocity is constantly changing.
Since there is no force acting in the horizontal direction, the horizontal component of the velocity does not change. So, both the assertion and the inference are true, and the inference is the correct interpretation of the assertion.
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