Q. A flywheel increases its angular velocity uniformly from 20 rad/s to 100 rad/s in 4 seconds. Its angular acceleration is:

एक फ्लाईव्हील अपने कोणीय वेग को 4 सेकंड में 20 रेड/सेकेंड से 100 रेड/सेकेंड तक समान रूप से बढ़ाता है। इसका कोणीय त्वरण है:

15 rad/s²
15 रेड/से.²

20 rad/s²
20 रेड/से.²

25 rad/s²
25 रेड/से.²

30 rad/s²
30 रेड/से.²

Angular acceleration $\alpha$ is calculated by:

α = \frac{ω_{f} - ω_{i}}{t} = \frac{100 - 20}{4} = \frac{80}{4} = 20 {rad/s}^{2}

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