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)

An object moves with constant velocity object mass = 6kg moves with constant velocity force acting on the object is Fext   =    μ mg    Fext=    0.6 × 6×10    Fext=    36 N---(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