A fly wheel gains a speed of $240$ rpm in $3 s$ . Calculate the change in its angular speed in three seconds. (in rad/s)

25.12

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21.36

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25.39

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22.36

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Solution

The correct option is C. $25.12$
Given,
Initial angular speed = $ω_{0} = 0 r p m = 0 r a d / s$
Final angular Speed $ω = 240 r p m = 240 \times \frac{2 π}{60} r a d / s = 25.12 r a d / s$
Thus the change in the angular speed =
$ω - ω_{0} = 25.12 - 0 = 25.12 r a d / s$ .

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