A heavy box is solid across a rough floor with an initial speed of \( 4 \mathrm{~m} / \mathrm{s}....

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A heavy box is solid across a rough floor with an initial speed of \( 4 \mathrm{~m} / \mathrm{s} \). If stops moving after 8 seconds.
\( \mathrm{P} \)
If the average resisting force of friction is \( 10 \mathrm{~N} \), the mass of the box (in \( \mathrm{kg} \) ) is
(1) 40
(2) 20
(3) 5
(4) 2.5


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