Answers (cont.)
n2.) Use pbefore=pafter
nPbefore=0kg.m/s + 2kg.m/s(right)
n=2kg.m/s(right)
n
nPafter=2kg.m/s(right)=3kg.m/s +
nP(0.2kg cart)  so….p of 0.2kg cart must be -1kg.m/s or 1kg.m/s(left)
n more…..