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A particle is thrown from the origin,at ...

A particle is thrown from the origin,at an angle `theta(0lttheta lt 90^(@))` such that it just crosses a wall of height `9m`. Wall is at `x=12m`. Speed of projection is `nsqrt(3)m/s` and particle strikes the ground at `x=48m`. Value of `n` is `(g=10m//s^(2))`

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