1.

A block of mass 4kg slides down a plane inclination at 370 with the horizontal. Thelength of plane is 3m. Coefficient of sliding is 0.2 workdone by friction isA) 72JB) -19.2JC) 19.2JD)-72J

Answer»

Total frictional force acting on the block is 𝛍mgcosx =mg𝛍cosx=4*10*0.2*4/5=32/5=6.4NSo work done by frictional force = F*D =6.4*3 =19.2J



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