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NEETPhysicsMotion in One Dimension

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): For a ball thrown vertically upwards and returning to the ground, its acceleration is constant and directed downwards throughout the motion. Reason (R): The speed-time graph for the entire journey of this ball is a straight line that crosses the time axis. In the light of the above statements, choo

Options

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

Correct answer

C. (A) is true but (R) is false

Step-by-step solution

Assertion (A) is true because a ball thrown vertically upwards moves under the influence of gravity alone (ignoring air resistance), so it experiences a constant downward acceleration ( g ) throughout its upward and downward journey. Reason (R) is false because speed is a scalar quantity and is the magnitude of velocity. Therefore, speed can never be negative. The speed-time graph of a ball thrown upwards will decrease linearly to zero at the highest point and then increase linearly as it falls back, forming a V-sh

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