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22. A particle starts rotating from rest. Its angular displacement is expressed by the following equationθ =0.025t square-0.1t where θ is in radian and t is in seconds. The angular acceleration of the particle is 

(a)   0.5 rad/sec2 at the end of 10 sec

(b)     0.3 rad/sec2 at the end of 2 sec

(c)   0.05 rad/sec2 at the end of 1 sec

(d)  Constant 0.05 rad/sec2

Ans. d

(25)

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