**Please help me with this error. Here is my code:**

```
# function for calculating kinetic energy
def cal_kinetic_energy(m, v):
# kinetic energy formula
return 0.5 * m * v**2
# main function
def main():
# input mass from user
m = input("Please enter the mass (kg): ")
# input velocity from user
v = input("Please enter the velocity (m/s): ")
# call kinetic energy method
**print( cal_kinetic_energy(m, v), "is the calculated kinetic energy")**
# call main
main()
```

I need help with line 14::

print( cal_kinetic_energy(m, v), âis the calculated kinetic energyâ)

Here is what it says in the program:

Traceback (most recent call last):

File âC:\Users\user\PycharmProjects\pythonProject\add.pyâ, line 14, in

print( cal_kinetic_energy(m, v), âis the calculated kinetic energyâ)

NameError: name âmâ is not defined