Table schema:
CREATE TABLE table_15314901_1 (coordinate_velocity_v_dx_dt_in_units_of_c VARCHAR, condition_parameter VARCHAR)

Question: If the the condition/parameter is rapidity of 2 hyperbolic radians, what is the coordinate velocity v dx/dt in units of c?
SQL: SELECT coordinate_velocity_v_dx_dt_in_units_of_c FROM table_15314901_1 WHERE condition_parameter = "Rapidity of 2 hyperbolic radians"