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v/(-a*t)=v0
a=-(v-v0)/t
b)m1 * v1 + m2 * v2 = (m1 + m2) * v3;
.......(m1 +m2)*v3 - m2*v2
v1 = ---------------------------
..............m1
......m1*v1+m2*v2
v3 = -----------------
.........m1+m2
........(m1 +m2)*v3 - m2*v2
m1 = ---------------------------
.................v1