По закону сохранения импульса:
0 = m1V1 + m2V2 ; m2 = 2m1;
V2 = m1V1/m2 = 4*20/8 = 10м/c;
E = mV^2/2 = 8*10^2/2 = 400Дж.
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По закону сохранения импульса:
0 = m1V1 + m2V2 ; m2 = 2m1;
V2 = m1V1/m2 = 4*20/8 = 10м/c;
E = mV^2/2 = 8*10^2/2 = 400Дж.