A block of mass 1 0 kg moving on a horizontal surface with speed 2...

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A block of mass 1 0 kg moving on a horizontal surface with speed 2 m s enters a rough surface The retarding force F on the block is given by k F 10m x 100 m F 0 x 10 m and x 100 X m where k 0 5 J The kinetic energy of the block at x 100 m is 1 4 5 J 3 0 85 J 2 2 5 J 4 1 5 J

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