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A particle A is thrown with initial velo...

A particle A is thrown with initial velocity `5m//s` along a frictionless inclined plane of inclination `beta`. Another particle B is thrown with initial velocity `10m//s` at an angle `alpha` with the horizontal at the same moment when A is thrown and from same positon as that of A. Both the particle meet again on the inclined plane. The value of `((pi)/(alpha +beta))` is

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