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Wypisz dane:
m1 = 2[kg];
m2 = 20[kg] ;
v2 = 90[km/h] / 3,6 = 25[m/s].
Wzór: (zasada zachowania pędu);
m1v1 = m2v2 II m1;
v1 = (m2v2) / m1.
Obliczenia:
v1 = (20*25) / 2 = 500 /2 = 250[m/s]
Odp. v1 =250[m/s].