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A \( 1.5 \mathrm{~kg} \) box is initially at rest on a horizontal surface when at \( \mathrm{t}=0 \) a horizontal force \( \vec{F}=(1.8 t) \hat{i} N \) (with \( t \) in seconds), is applied to the box. The acceleration of the box as a function of time \( t \) is given by: \( \left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right) \)
\( \vec{a}=0 \) for \( 0 \leq \mathrm{t} \leq 2.85 \)
\( \vec{a}=(1.2 t-2.4) \hat{i} \mathrm{~m} / \mathrm{s}^{2} \) for \( t2.85 \)
The coefficient of kinetic friction between the box and the surface is:
(a) 0.12
(b) 0.24
(c) 0.36
(d) 0.48
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