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                                    A block of mass 10 kg is moving with a uniform speed of 20 m/s enters onto a rough surface of coefficient of friction 0.8, the time taken by the block to come to rest is | 
                            
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Answer»  A block of mass 10 kg is moving with a uniform speed of 20 m/s enters onto a rough surface of coefficient of friction 0.8, the time taken by the block to come to rest is  | 
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