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Question

# A particle moving in a circle changes its angular velocity uniformly from 20 rad/s to 40 rad/s in first 5 seconds. Find the angular acceleration of the particle.

A
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B
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C
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D
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Solution

## The correct option is A 4 rad/s2It is given that the angular velocity uniformly changes from 20 rad/s to 40 rad/s in 5 s By the equation of motion having constant angular acceleration (α) we know that, ω=ω0+αt, Given ω0=20 rad/s is the initial angular velocity, ω=40 rad/s, is the final angular velocity and t=5 s. We get the angular acceleration as, α=40−205=4 rad/s2 Option A is the correct answer.

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