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A particle is in circular motion in a ho...

A particle is in circular motion in a horizotantal plane. It has angular velocity of 10`pi rad//s` at the end of 2 s and angular velocity 15 `pi rad//s` at the end of 4s. The angular acceleration of particle is

A

5`pi``rad//s^2`

B

2.5`pi``rad//s^2`

C

6`pi``rad//s^2`

D

16`pi``rad//s^2`

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The correct Answer is:
B
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