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A particle is to be projected horizontal...

A particle is to be projected horizontally with velocity `v` from a point `P`, which is `60 m` above the foot of a plane inclined at angle `45^(@)` with horizontal as shown in figure. The particle hits the plane perpendicularly at `A`. After rebound from inlined plane it again hits at `B`. If coefficient of restitution between particles and plane is `(1)/(sqrt(2))` then,

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