Question

A body of mass 60kg is pushed 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. The acceleration of the body is

• A. $0.98m{s}^{-2}$
• B. $3.92m{s}^{-2}$
• C. $4.90m{s}^{-2}$
• D. Zero

Answer 1

The correct option is A $0.98m{s}^{-2}$

Net force acting on the body $=({\mu }_s-{\mu }_k)$ mg

Acceleration $=({\mu }_s-{\mu }_k)g=0.1\times 9.8$$=0.98m{s}^{-2}$