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m1 * v1 = m2 * v2
W tym wypadku
x = m1
800 m/sx = 8 kg * 2 m/s (dzielimy przez 800 m/s)
x = 0,02 kg = 2 gramy
v1=2m/s
v2=800m/s
m2=?
m1v1=m2v2/:v2
m2=m1v1/v2
m2=16 kg*m/s/800 m/s
m2=0,02 kg