If a particle rotates along a circle of radius 3 m with an angular acceleration of `(pi)/(2) "rad"//s^(2)` starting from rest, then its average veloci
If a particle rotates along a circle of radius 3 m with an angular acceleration of `(pi)/(2) "rad"//s^(2)` starting from rest, then its average velocity over the time it covers quarter circle is :
A. `1 m//s`
B. `2 m//s`
C. `3 m//s`
D. `4 m//s`
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Correct Answer - C
`theta = omega_(0) t + (1)/(2) alpha t^(2)`
`(pi)/(2) = 0 + (1)/(2) (pi)/(2) t^(2)`
`t = sqrt2`
average `v = (s)/(t) = (R sqrt2)/(sqrt2) = R = 3 ms^(-1)`
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