Q 2330756612.     1.49. A solid body rotates about a stationary axis so that its angular
velocity depends on the rotation angle `varphi` as `omega = omega_0 - a varphi`, where
`omega_0` and a are positive constants. At the moment `t = 0` the angle
`varphi = 0`. Find the time dependence of
(a) the rotation angle;

A

`omega_0/k(1+e^(-kt))`

B

`omega/k(1+e^(-kt))`

C

`omega/k(1-e^(-kt))`

D

`omega_0/k(1-e^(-kt))`

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