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Particle "A" is released from a point "P...

Particle "A" is released from a point "P" on a smooth inclined plane inclined at an angle `alpha` with the horizontal.At the same instant another particle "B" is projected with initial velocity 'u' making an angle `beta` 'with the horizontal.Both the particles meet again on the inclined plane.the relation between ' `alpha` and `beta` is 1) `alpha+beta=(pi)/(6)` 2) `alpha+beta=(pi)/(4)` 3) `alpha+beta=(pi)/(3)` 4) `alpha+beta=(pi)/(2)`

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