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Standard XII
Physics
Question

Assertion :In a projectile motion, the angle between the instantaneous velocity and the acceleration at the highest point is 180o. Reason: At the highest point, velocity of projectile will be in horizontal direction only.
  1. Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
  2. Both Assertion and Reason are true, but Reason is not the correct explanation of the Assertion.
  3. Assertion is true, but the Reason is false.
  4. Assertion is false, but the Reason is true.

A
Assertion is true, but the Reason is false.
B
Assertion is false, but the Reason is true.
C
Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
D
Both Assertion and Reason are true, but Reason is not the correct explanation of the Assertion.
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Solution
Verified by Toppr

At any time acceleration acting in downward direction g is constant.
At highest point, velocity is only in x direction.
So, angle between V and g is 90o.

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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) If assertion and reason both are false.

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