Ques) A block is projected up aplne at 30° to the horizontal. It returns to it's starting point with 1/3 rd of it's initial velocity. Calculate the coefficient of kinetic friction b/w the block and the plane.
19@tush............do you have just loads of questions only......never seen you give any compact answer....this is a really stupid one sided affair!!!!
106Let its initial velocity be v
Let it travel 'l' distance along the incline before it stops,
then using WE theorem
-mv2/2= -mglsin30° - μmgl .... (i)
finally it reaches with speed v/3 using WE again
m(v/3)2/2 = mglsin30° - μmgl .... (ii)
From these two equations you should be able to calculate μ.
im getting μ=0.4
