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v2 = 0
v3 = 1 m/s
v1 = ?
p0 = pk (zasada zachowania pędu)
m1*v1 + m2*v2 = v3 * (m1 + m2)
m1*v1 = v3 * (m1 + m2)
v1 = [ v3 * (m1+m2) ] / m1
v1 = 1 * 1 / 0,5 = 2 m/s