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a particle moving along a circular track of radius D with uniform speed,the ratio of distance covered to the displacement in quatar revolution

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volume of a cube with integral sides is the same as the area of a square with integral sides.which of these can be the volume of the cube formed by using the square and its replicas as the 6 faces a)19683 b)512 x)256 d)both a and b e)both a and c a particle starts from rest and has an acceleration of 4m/s 2 for 20 seconds after that it travels for 30 seconds with constant speed and then undergoes a retardartion of 8m/s2. and come back to rest.the total distance covered