A table fan rotating at a speed of \( 2400 \mathrm{rpm} \) is switched off and the resulting var...

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A table fan rotating at a speed of \( 2400 \mathrm{rpm} \) is switched off and the resulting variation of the rpm
\( \mathrm{P} \)
with time is shown in the figure. The total number
W
of revolutions of the fan before it come to rest is:
(1) 420
(2) 280
(3) 190
(4) 16800
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