def f(bullet_mass, bullet_velocity):
gun_mass = 1.0
gun_velocity = bullet_mass / gun_mass * bullet_velocity
bullet_energy = bullet_mass * bullet_velocity**2 / 2
gun_energy = gun_mass * gun_velocity**2 / 2
print bullet_velocity, gun_velocity
print bullet_energy, gun_energy, bullet_energy + gun_energy
f(0.010, 300.0)
print
f(0.020, 211.1)
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