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A wheel which is initially at rest is su...

A wheel which is initially at rest is subjected to a constant angular acceleration about its axis. It rotates through an angle of `15^@` in time t sec. The increase in angle through which it rotates in the next 2t sec is

A

`90^@`

B

`120^@`

C

`30^@`

D

`45^@`

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The correct Answer is:
B
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