If a block is pulled up an inclined plane with a force of \( 10 \mathrm{~N} \) along the line of...

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If a block is pulled up an inclined plane with a force of \( 10 \mathrm{~N} \) along the line of greatest slope, the
\( \mathrm{P} \) block slides up with constant velocity. If the block W. is pulled down the inclined plane with a force of 8 \( \mathrm{N} \) along the line of greatest slope, the block slides down with constant speed. Find the force of kinetic friction between the block and the plane?
(1) \( 2 \mathrm{~N} \)
(2) \( 8 \mathrm{~N} \)
(3) \( 10 \mathrm{~N} \)
(4) \( 9 \mathrm{~N} \)
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