m1 = 0.8
m2 = 3.0
speed1 = 50.0
speed2 = -50.0
resulting_speed = (m1 * speed1 + m2 * speed2) / (m1 + m2)
print 'Resulting speed', abs(resulting_speed)
print 'Smart delta-v', abs(speed1 - resulting_speed)
print 'Pick-up delta-v', abs(speed2 - resulting_speed)
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