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
0.98ms2
B
3.92ms2
C
4.90ms2
D
Zero

Solution

## The correct option is A $$0.98 m{ s }^{ -2 }$$ Net force acting on the body $$=(\mu_{\mathrm{s}}-\mu_{\mathrm{k}})$$ mg Acceleration $$=(\mu_{\mathrm{s}}-\mu_{\mathrm{k}})\mathrm{g}= 0.1\times 9.8$$$$=0.98 ms^{-2}$$Physics

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