First slide
Work
Question

An object of mass 6 kg is moved with uniform speed of 8 m/s for 8 sec on a surface.  Co efficient of friction between the body and the surface is 0.6  , work done for a given motion of the body is  (take   g  =   10m/s2)

Moderate
Solution

An object moves with constant velocity
 object mass = 6kg moves with constant velocity force acting on the object is Fext   =    μmg  Fext=    0.6×6×10  Fext=    36N---(1) work done on the object is W= Fext.S---(2) displacement S=velocity . time=8x8=64 m substitute eqn(1)in (2) work done on the object is W=36 x 64=2304 joule   
   
 

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