Correct Answer: Option B

Explanation

Answer: B. 0.015

(Net F = ma = 40×0.3 = 12 N;

friction = 18 - 12 = 6 N;

μ = \(\frac{\text{friction}}{\text{mg}}\) = \(\frac{6}{(40×10)}\) = 0.015.)

There is an explanation video available below.

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