SELECT COUNT(coordinate_velocity_v_dx_dt_in_units_of_c) FROM table_15314901_1 WHERE velocity_angle_η_in_i_radians = "ln[2 + √5] ≅ 1.444"
Berapa kecepatan koordinat v dx/dt dalam satuan jumlah total C jika sudut kecepatan η dalam i-radians adalah ln [2 + √5] ≅ 1.444?
CREATE TABLE table_15314901_1 (coordinate_velocity_v_dx_dt_in_units_of_c VARCHAR, velocity_angle_η_in_i_radians VARCHAR)