Question

Assertion :In a projectile motion, the angle between the instantaneous velocity and the acceleration at the highest point is ${180}^o$. Reason: At the highest point, velocity of projectile will be in horizontal direction only.

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

Answer 1

The correct option is D Assertion is false, but the Reason is true.

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 ${90}^o$.