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NEETPhysicsMotion in Two Dimensions

Assertion : In case of projectile motion, the magnitude of rate of change of velocity is variable. Reason : In projectile motion, magnitude of velocity first decreases and then increases during the motion.

Options

  1. AIf both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
  2. BIf both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  3. CIf Assertion is true but Reason is false.
  4. DIf Assertion is false but Reason is true.

Correct answer

D. If Assertion is false but Reason is true.

Step-by-step solution

Solution: The assertion is false, and the reason is true. - Assertion: The rate of change of velocity is acceleration. In projectile motion, ignoring air resistance, the acceleration is due to gravity ( (g )), which is constant. Therefore, the magnitude of the rate of change of velocity is constant, not variable. So, the assertion is false. - Reason: The magnitude of velocity (speed) in projectile motion is given by (|v|= v_x^2+v_y^2 ). The horizontal velocity ( (v_x )) is constant, but the vertical velocity ( (v_y

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