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A box when dropped from a certain heigh...

A box when dropped from a certain height reaches the ground with a speed ν. When it slides from rest from the same height down a rough inclined plane inclined at an angle `45^(@)` to the horizontal, it reaches the ground with a speed `ν//3`. The coefficient of sliding friction between the box and the plane is (acceleration due to gravity is `10 ms^(-2))`

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