Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
If the lorentz factor γ dt/dτ = e/mc 2 is √5 ≅ 2.236, what is the proper velocity w dx/dτ in units of c?

### Inputs:
table_name: table, columns: ['Condition/Parameter', 'Coordinate velocity v dx/dt in units of c', 'Velocity angle η in i-radians', 'Proper velocity w dx/dτ in units of c', 'Lorentz factor γ dt/dτ = E/mc 2']

### Response:
SELECT Proper velocity w dx/dτ in units of c FROM table WHERE Lorentz factor γ dt/dτ = E/mc 2 = √5 ≅ 2.236