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 revolution/minute with time is shown in Fig. \( 7(\mathrm{CF}) .12 \). The total number of revolutions of the fan before it comes to rest is
(A) 280
(B) 380
(C) 420
(D) 160
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