# Given below are two statements:  Assertion (A): If the average velocity of a particle is zero in a time interval, it is possible that the instantaneous velocity is never zero in the interval. Reason (R): If the average velocity of a particle moving on a straight line is zero in a time interval then at least for one moment the instantaneous velocity will also be zero in the interval. 1. Both (A) and (R) are True and (R) is the correct explanation of (A). 2. Both (A) and (R) are True but (R) is not the correct explanation of (A). 3. (A) is True but (R) is False. 4. Both (A) and (R) are False.

Subtopic: Â Average Speed & Average Velocity |
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Given below are two statements:
 Assertion (A): Parabolic curve of velocity versus time implies that its acceleration varies linearly with time. Reason (R): Parabolic curve represent quadratic function and acceleration is the first derivative of velocity so the acceleration versus time graph will be linear.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.
Subtopic: Â Acceleration |
Â 61%
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Given below are two statements:
 Assertion (A): In the presence of air friction, if the ball is thrown vertically upwards, the time of ascent is less than the time of descent. Reason (R): Force due to air friction always acts opposite to the motion of the body.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.
Subtopic: Â Acceleration |
Â 68%
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Select the correct option based on the statements given below:
 Assertion (A): A body can have a velocity varying in both magnitude and direction but still have constant acceleration. Reason (R): Acceleration is defined as the rate of change of speed with respect to time.

 1 Both assertion & reason are true and the reason is the correct explanation of the assertion 2 Both assertion & reason are true but the reason is not the correct explanation of the assertion 3 Assertion is true but reason is false. 4 Both assertion and reason are false statements.

Subtopic: Â Acceleration |
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Select the correct option based on the statements given below:
 Assertion (A): A body can have acceleration even if its velocity is zero at a given instant of time. Reason (R): A body is momentarily at rest when it reverses its direction of motion.

 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 Both (A) and (R) are False.
Subtopic: Â Uniformly Accelerated Motion |
Â 59%
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Given below are two statements:
 Assertion (A): Displacement of a body may be zero, when distance travelled by it is not zero. Reason (R): The displacement is the longest distance between initial and final position.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.

Subtopic: Â Distance & Displacement |
Â 83%
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Given below are two statements:
 Assertion (A): A particle having zero acceleration must have a constant speed. Reason (R): A particle having constant speed must have zero acceleration.

 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 Both (A) and (R) are False.
Subtopic: Â Acceleration |
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Given below are two statements:

 Assertion (A): Two balls of different masses are thrown vertically upward with the same speed. They will pass through their point of projection in the downward direction with the same speed. Reason (R): The maximum height and downward velocity attained at the point of projection are independent of the mass of the ball.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.
Subtopic: Â Uniformly Accelerated Motion |
Â 78%
From NCERT
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Given below are two statements:
 Assertion (A): Adding a scalar to a vector of the same dimension is a meaningful algebraic operation. Reason (R): Displacement can be added to distance.

 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 Both (A) and (R) are False.
Subtopic: Â Distance & Displacement |
Â 67%
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Given below are two statements:
 Assertion (A): The average velocity of the object over an interval of time is either smaller than or equal to the average speed of the object over the same interval. Reason (R): Displacement is the shortest distance.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.

Subtopic: Â Average Speed & Average Velocity |
Â 59%
From NCERT
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