Assertion (A): When the displacement of a body is directly proportiona...
Explanation:To determine the correctness of the assertion and the reason, let's analyze each statement separately:
Assertion (A): When the displacement of a body is directly proportional to the square of the time. Then the body is moving with uniform acceleration.This statement implies that the displacement-time relationship is given by:
s ∝ t^2
If displacement is directly proportional to the square of time, it means that the body is undergoing uniform acceleration. This is because the equation of motion for an object moving with uniform acceleration is given by:
s = ut + (1/2)at^2
Since the displacement is directly proportional to the square of time, the coefficient of t^2 is (1/2)a, which means the acceleration is constant. Therefore, assertion (A) is true.
Reason (R): The slope of velocity-time graph with time axis gives acceleration.The slope of a velocity-time graph represents the rate of change of velocity with respect to time, which is acceleration. This is derived from the definition of acceleration as the rate of change of velocity:
a = Δv / Δt
The slope of the velocity-time graph is given by:
slope = (change in velocity) / (change in time)
Therefore, the reason (R) is true.
Conclusion:From the analysis of both the assertion and the reason, we can conclude that:
Both A and R are true but R is not the correct explanation of A.The reason (R) is true and provides additional evidence for the validity of the assertion (A), but it does not directly explain why the body is moving with uniform acceleration when the displacement is proportional to the square of time.