A 60 kg body is pushed with just enough force to start it moving across a floor and the same force continues to act afterwards. The coefficient of static friction and sliding friction are 0.5 and 0.4 respectively. The acceleration of the body is

Options

A. `6 m//s^(2)`
B. `4.9 m//s^(2)`
C. `3.92 m//s^(2)`
D. `1 m//s^(2)`

Answer

D

Explanation

`a=(f_(s)-f_(k))/(m)=((mu_(s)-mu_(k))mg)/(m) =(mu_(S)-mu_(k))g`
`=(0.5 -0.4)10 =1 m//sec_(2)`