A body of mass 40kg resting on a rough horizontal surface is subjected to a force `P` which is just enough to start the motion of the body. If `mu_(s)=0.5mu_(k)=0.4 , g=10ms^(-2)` an dthe force `P` is continuously applied on the body, then the accceleration of the body is.A. zeroB. `1m//s^(2)`C. `2m//s^(2)`D. `2.4m//s^(2)`

A body of mass 40kg resting on a rough horizontal surface is subjected

1.	A body of mass 40kg resting on a rough horizontal surface is subjected to a force `P` which is just enough to start the motion of the body. If `mu_(s)=0.5mu_(k)=0.4 , g=10ms^(-2)` an dthe force `P` is continuously applied on the body, then the accceleration of the body is.A. zeroB. `1m//s^(2)`C. `2m//s^(2)`D. `2.4m//s^(2)`
Answer» Correct Answer - b When body is just to start moving then force `F =mu_(s) mg` When body starts moving with acceleration a then `F - F_(k) = ma`, where `F_(k) = mu_(k) mg` or `mu_(s) mg-mu_(k) mg = ma` or `a= (mu_(s) -mu_(k)) g = (0.5 -0.4) xx 10 = 1ms^(2)` .

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