A block is released from the top of a smooth inclined plane of inclination \( \theta \) as shown...

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A block is released from the top of a smooth inclined plane of inclination \( \theta \) as shown in figure-3.105. Let \( v \) be the speed of the particle after travelling a distance \( s \) down the plane. Then which of the following will remain constant :
(A) \( v^{2}+2 g s \sin \theta \)
(B) \( v^{2}-2 g s \sin \theta \)
(C) \( v-\sqrt{2 g s} \sin \theta \)
(D) \( v+\sqrt{2 g s} \sin \theta \)
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