A SMALL 0.65 BOX IS LAUNCHED FROM REST BY A HORIZONTAL SPRING .THE BLOCK SLIDES ON A TRACKDOWN A HILLAND COMES TO REST AT A DISTANCE d FROM THE BASE OF THE HILL .KINEIC FRICTION BETWEEN THE BOX AND THE TRACK IS NEGLIGIBLE ON THE HILL,BUT THE COEFFICIENT OF KINETIC FRICTION BETWEEN THE BOX AND THE HORIZONTAL PARTS OF TRACK IS 0.35.THE SPRING HAS A  SPRING  34.5N AND IS COMPRESSED 30cm WITH THE BOX ATTACHED.THE BOX REMAINS ON THE TRACK AT ALL TIMES.   (a)xcalculate the speed of the box before it starts descending down the hill

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