A body of mass $10 kg$ is moving with an initial speed of $20 m / s$. The body stops after $5 s$ due to friction between body and the floor. The value of the coefficient of friction is: (Take acceleration due to gravity $g=10 ms^{-2}$ )
(1) 0.2
(2) 0.3
(3) 0.5
(4) 0.4
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