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
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a