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A body takes 9/7times as much time to slide down a rough inclined plane as it takes to slide an identical but smooth inclined plane .find coefficient of friction if the angle of incline is 30 degree

A body takes 9/7times as much time to slide down a rough inclined plane as it takes to slide an identical but smooth  inclined plane  .find coefficient of friction if the angle of incline is 30 degree
 
 

Grade:12

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