Question

A body of weight $64N$ is pushed with just enough force to start it moving across a horizontal floor and the same force continues to act afterwards. If the coefficients of static and dynamic friction are $0.6$ and $0.4$ respectively. The acceleration of the body will be (acceleration due to gravity $=$ g)

• A. $\frac{g}{2}$
• B. $0.64g$
• C. $\frac{g}{32}$
• D. $0.2g$

Answer 1

The correct option is D $0.2g$

Total force: $ma=mg(0.6-0.4)$

So, acceleration of body is: $a=0.2g$