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25. A rigid body is rotating with variable angular velocity (a-bt) at any instant of time t. The total angle subtended by it before coming to rest will be (a and b are constants)

(a)    (a-b)a/2

(b)   a2/2b

(c)   a2-b2/2b

(d)  a2-b2/2a

Ans. b

(11)

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