>>> from fisica2 import velocitat

>>> v1 = velocitat(122.95, 42.195)   # WR Maratò
>>> round(v1, 1)
5.7
>>> v2 = velocitat(2, 2)
>>> round(v2, 2)
16.67
>>> v3 = velocitat(2.5, 0)
>>> round(v3, 2)
0.0