COMEDK · Physics · 4. Motion In Two Dimensions

For a projectile, the square of its horizontal range is equal to 8 times the square of the maximum height it reached. What is the angle of projection of the projectile?

A \(\theta=\tan ^{-1}(\sqrt{2})\)
B \(\theta=\tan ^{-1}\left(\dfrac{1}{\sqrt{2}}\right)\)
C \(\theta=\tan ^{-1}(\sqrt{3})\)
D \(\theta=\tan ^{-1}\left(\dfrac{1}{\sqrt{3}}\right)\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(\theta=\tan ^{-1}(\sqrt{2})\)

Step-by-step Solution

Detailed explanation

The horizontal range \(R\) of a projectile is given by \(R = \dfrac{u^2 \sin(2\theta)}{g} = \dfrac{2u^2 \sin\theta \cos\theta}{g}\). The maximum height \(H\) of a projectile is given by \(H = \dfrac{u^2 \sin^2\theta}{2g}\). The problem states that \(R^2 = 8H^2\). Substituting…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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