If the the condition/parameter is rapidity of 2 hyperbolic radians, what is the coordinate velocity v dx/dt in units of c?
create table table_15314901_1 (coordinate_velocity_v_dx_dt_in_units_of_c varchar, condition_parameter varchar, PRIMARY KEY (coordinate_velocity_v_dx_dt_in_units_of_c))
select coordinate_velocity_v_dx_dt_in_units_of_c from table_15314901_1 where condition_parameter = "rapidity of 2 hyperbolic radians"