Solution Apply the conservation of momentum P=P cos0+ P, cos(B-6 0=Pl 6+ P, sin(B-8) KE\nm22m2m→△KE=KE-KEP12,P2P 2m2m2m Using the adding of the vectors P=P+P+2P P2 cosp →AKE=(P+P-P2)=1 2mm,(-2P P, B) →△KE=、P'P'cosBSolution: Apply the conservation of momentum ' cos ' cos( ) P1 = P 1 θ + P 2 β −θ m P m P m P KE KE KE m P m m v KE mv P P f i 2 2 ' 2 ' 2 2 2 1 0 ' sin ' sin( ) 2 1 2 2 2 1 2 2 2 2 1 2 = = = ⇒ ∆ = − = + − = θ + β −θ Using the adding of the vectors m P P KE P P m P P P m KE P P P P P β β β ' 'cos ( 2 ' 'cos ) 2 1 ( ' ' ) 2 1 ' ' 2 ' 'cos 1 2 1 2 2 2 2 2 1 1 2 2 2 2 1 2 1 ⇒ ∆ = − ⇒ ∆ = + − = ⋅ − = + +