1.

A smooth block is released at rest on a 45° incline and then slides a distance d. The time taken to slis n times as much to slide on rough incline than on a smooth incline. The coefficient of friction is-de[JEE (Main) 2005, 4/300]

Answer»

Downward acceleration is g sin∅-∪gcos∅Time taken is for incline distance=1/2(gsin∅-∪gcos∅)t^2since angle is 45° and ratio of time is x,(g/√2-∪g/√2)/(g/√2)=1/x^2∪=1-(1/x^2)



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