......... $m/s^2$ is magnitude of acceleration of a block moving with speed $10\,m/s$ on a rough surface if coefficient of friction is $0.2$.
A$2$
B$0.2$
C$0.1$
D$1$
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A$2$
a $\left| a \right|\, = \,\mu g\, = \,0.2 \times 10\, = 2{\mkern 1mu} \,\,m/{s^2}$
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