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The direction of motion of a projectile ...

The direction of motion of a projectile at a certain instant is inclined at an angle `60^(@)` to the horizontal. After `sqrt(3)` seconds it is inclined an angle `30^(@)`. If the horizontal compound of velocity of projection is `3n` (in `m//sec)` then value of n is : `(take g = 10 m//s^(2))`

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