A block slides down an incline of `30^(@)` with the horizontal starting from rest it covers `8m` in the first two seconds Find the coefficient of kinetic friction between the two .

A block slides down an incline of `30^(@)` with the horizontal startin

1.	A block slides down an incline of `30^(@)` with the horizontal starting from rest it covers `8m` in the first two seconds Find the coefficient of kinetic friction between the two .
Answer» Correct Answer - `0.11` Here, `theta = 30^(@), u = 0, s = 8 m, t = 2s` From `s = y t+ (1)/(2)a t^(2)` `8 = 0 + (1)/(2) xx a (2)^(2)` or `a = 4 ms^(-2)` As `a = g (sin theta - mu cos theta)` `:. 4 = 9.8 (sin 30^(@) - mu cos 30^(@))` `= 9.8 ((1)/(2) - mu sqrt3/(2))` `mu = (0.9)/(4.9 sqrt 3)=0.11` .

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A block slides down an incline of `30^(@)` with the horizontal starting from rest it covers `8m` in the first two seconds Find the coefficient of kinetic friction between the two .

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