The scrimmage kick has touched the ground and K2 has possessed the ball, and touched down at the R-1. Since K can recover a grounded scrimmage kick, but not advance it, the play is dead when K possessed the scrimmage kick. 1st & 10 for R at the R-1, which is both the spot of first touching and the spot where the play ended.
All momentum did was cause K to carry a dead ball into the EZ, which has no bearing on anything.
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