A body of mass 60 kg is pushed up with just enough force to start it moving on a rough surface with `mu_(s) = 0.5` and `mu_(k) = 0.4` and the force continues to act afterwards. What is the acceleration of the body ?

Explanation

`m= 60 kg, mu_(s) = 0.5 , mu_(k) = 0.4`
Force f = ma =`m(mu_(s)-mu_(k)) g`
`therefore a=(mu_(s)-mu_(k))g`
`=(0.5 - 0.4) 9.8 = 0.98 m//s^(2)`