A rigid body rotates about a fixed axis with variable angular velocity equal to (a - bt) at time t, where a and b are constants. The angle through which it rotates before coming to rest is
1
\(\frac{a^2}{2 b}\)
2
\(\frac{a^2}{b}\)
3
\(\frac{a^2}{4 b}\)
4
\(\frac{a^2}{4 b^2}\)
5
Question Not Attempted