A block of mass $1 k g$ just remains in equilibrium with the vertical wall of cart accelerating uniformly with $20 m / s^{2}$ as shown. The coefficient of friction between block and wall is ( $g = 10 m / s^{2}$ )

0.1

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0.5

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1

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Solution

The correct option is C $0.5$
$a = 20 ㎨ N = 1 \times 20 N f = μ \times 20 f = m g μ \times 20 = 10 μ = \frac{1}{2} = 0.5$

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