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. `1 ms^(-2)`C. `2 ms^(-2)`D. `2.4 ms^(-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. `1 ms^(-2)`C. `2 ms^(-2)`D. `2.4 ms^(-2)`
Answer» Correct Answer - B (b) Force, `P=f_(m)=mu_(0) mg`(when body is rest) When the body starts moving with acceleration a, then `P-F_(k)=ma` `mu_(0) mg-mu _(k) mg =ma` `a=(mu_(0)=mu_(k))g` =(0.5-0.4)10 `=0.1xx10ms^(-2)=1 ms^(-2)`

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