Question

Three balls of same masses are projected with equal speeds at angle 15°,45°,75°, and their ranges are respectively R₁, R₂ andR₃ , then

Moderate

Solution

At 45°, range is maximum. At 15° and 75°, ranges are equal.
$As, R_{θ} = R_{90^{0} - θ} ∵ R_{15^{0}} = R_{75^{0}} < R_{45^{0}} \Rightarrow R_{1} = R_{3} < R_{2}$

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