3 Th ee small smo h se res \(A , B\) ad \(C 6\) eq l radi ad 6 masses \(4 \mathrm {~g} \quad 2 \mathrm {~g}\) ad 3 g resp ctie ly, lie in th todr in a strait lie o a smo hb izt al p ae. In tially, \(B\) ad \(C\) are at rest ad \(A\) is mi g ard \(B\) with sp ed \(6 \mathrm {~ms} ^ { - 1 }\). After th cb liso with \(B\), se re \(A\) co in s to mo in the same d rectim withs p ed \(\mathrm { ms } ^ { - 1 }\).

1. Fid b sp e \(\boldsymbol { \Phi } \quad B\) after th s cb liso Se re \(B\) cb lid s with \(C\).I it \(h\) s cb lisd \(\mathbf { b }\) se two se res co lesce tof \(\mathbf { o }\) m am \(\mathbf { b }\) ect \(D\).
2. Fid b sp e \(D\) after th s cb lisin
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