Question

15-83. Two coins A and B have the initial velocities shown just before they collide at point. If they have weights of WA 13.2(10-)) Ib and Wg = 6.60(10")) Ib and the surface upon which they slide is smooth, determine their speeds just after impact. The cocfficient of restitution is e-0.65 2 ft/s 3 fts -30° Line of impact

Answer 1

Line of Impact Tangential direction (a (any) & ftlee 3 ftlo B 38. ly-axis 38 Lies of Impact diraten Resolee the velocitics of coins of and B along line of Impact and tangential u= aftles, Unk= acasso 1- 732 fels Uly a fels 12 = 3 felse U2x = -2.598 fels Uzg=-105 ft/s

Along the fansential direction, before and after Impact. The velocity demains constant. hence! Vix = Uan+1.732 felee Vzx = U2x==20598 ftlee. Equation along Apply momentum dice if Impact Malay & M Bluzy Mavagt MB vay (13.2) (1) +(6-6)(-45) * = (3:2)(Viy) +(66) (424) 1362 Vig + 6.6 Vzy=-3.3

co eficient of Restitution, e=0.65 (vey)-(Vry) a uny- lag 0.65 = Vzg Vig 1-(-15) Vag - Vay 1.625 solue 0 o 6, we get . Vly - 0.375 fels Vag 1e2g fels find the velocity of coin à after impact VA=Tuntuig - Se 132 +60 3.750 = VA = 1.772 Pt 1sec Find the velocity of coin 'B' afta Impact VB = Jux+r24 SE 2.598 + 1628² 2.88 pe free

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