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In the adjacent figure AB is an inclined...

In the adjacent figure AB is an inclined wall making an angle `alpha = 30^@` with the horizontal (x-axis). AB crosses the y-axis at a height `h = (10 N)/3` m. A small stone is projected from the origin ‘O’ with the speed u = 10 m/s at angle `60^@` with the horizontal. Find the value of N, if the stone just grazes the wall. `(g =10 m//s^(2))`

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