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NEET 2022 (Phase 1) · Velocity, Momentum & Energy in Flight

Velocity, Momentum & Energy in Flight question from NEET 2022 (Phase 1)

Q11NEET 2022 · PHASE 1Easy

Velocity, Momentum & Energy in Flight

A ball is projected with a velocity, 10 ms ${}^{-1}$ , at an angle of 60 $^\circ$ with the vertical direction. Its speed at the highest point of its trajectory will be

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Answer: (b)

$60^\circ$ with the vertical means $\theta = 30^\circ$ with the horizontal.
At the top, speed $= u\cos\theta = 10\cos 30^\circ = 10 \times \frac{\sqrt{3}}{2}$
So the answer is (b) $5\sqrt{3}\text{ m s}^{-1}$ .

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