A block of mass \( 15 \mathrm{~kg} \) is placed on a long trolley. The coefficient of friction b...

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A block of mass \( 15 \mathrm{~kg} \) is placed on a long trolley.
The coefficient of friction between the block and trolley is \( 0.18 \). The trolley accelerates from rest with \( 0.5 \mathrm{~m} / \mathrm{s}^{2} \) for \( 20 \mathrm{~s} \). then what is the friction force?
(1) \( 3.5 \mathrm{~N} \)
(2) \( 133.3 \mathrm{~N} \)
(3) \( 7.5 \mathrm{~N} \)
(4) N.O.T.
\( \mathrm{P} \)
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