A ball of mass `m` is attached to a cord of length `L`, pivoted at point `O`, as shown in Fig. The ball is released from rest at point A, swings down and makes an inelastic collision with a block of mass `2m` kept on a rough horizontal floor. The coefficient of restitution of collision is `e = 2//3` and coefficient of friction between block and surface is After collision, the ball comes momentarily to rest at `C` when cord makes an angle of `theta` with the vertical and block moves a distance of `3L//2` on rough horizontal floor before stopping. The values of `mu` and `theta` are, respectively,