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A wheel, starting from rest, rotates with a constant angular acceleration. The ratio of the angle it turns through in the first 2 s to the angle it turns through in the next 2 s is

Asked in JEE Main 2nd Sept 2nd Shift 2020 · Equations of rotational motion

Answer: (3) 1:3

Step-by-step solution

From rest, θ∝ t². In the first 2 s: θ₁∝ 4. In the first 4 s: ∝16.

Next 2 s: 16-4=12. Ratio θ₁:θ₂=4:12=1:3.

Why the other options are wrong

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