A particle is projected from a horizontal surface with a velocity of \( 20 \mathrm{~m} / \mathrm...

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A particle is projected from a horizontal surface with a velocity of \( 20 \mathrm{~m} / \mathrm{s} \) at an angle of \( 60^{\circ} \) with the horizontal. When it hits the horizontal surface, its velocity makes an angle of \( 30^{\circ} \) with the horizontal. Apart from gravity, a horizontal force acts on the particle during the motion. The speed of the particle when it hits the ground is
(a) \( 20 \mathrm{~m} / \mathrm{s} \)
(b) \( 20 \sqrt{3} \mathrm{~m} / \mathrm{s}(c) 10 \mathrm{~m} / \mathrm{s} \)
(d) \( 10 \sqrt{3} \mathrm{~m} / \mathrm{s} \)
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