A projectile is projected on a smooth inclined plane P of inclination \( 30^{\circ} \). The hori...

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A projectile is projected on a smooth inclined plane
P of inclination \( 30^{\circ} \). The horizontal range is \( 120 \mathrm{~m} \). If

W angle of projection is be \( 60^{\circ} \), the speed of projection is
(1) \( 37.2 \mathrm{~ms}^{-1} \)
(2) \( 26.3 \mathrm{~ms}^{-1} \)
(3) \( 20 \mathrm{~ms}^{-1} \)
(4) \( 40 \mathrm{~ms}^{-1} \)
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