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A small ball is projected up a smooth in...

A small ball is projected up a smooth inclined plane with an initial speed of `10m//s` at `30^(@)` from the bottom edge of the slope. It returns to the edge after `2s`. The ball is in contact with the inclined plane throughout the process. The inclination angle (in degree) of the plane is `N`. The value of `N//6` is

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