Question

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6. [7] (Phys 144 Fall 2018 Final Exam) Hockey puck A is shot along the x-axis at 5.60 m/s at identical hockey puck B which is initially at rest on horizontal frictionless ice. The collision is off-center, and they scatter at the angles shown. initial final 5.60 m/s a) [3] Find the speeds VA2 and vaz of the pucks after the collision. b) [1] Find the percentage of kinetic energy converted into other forms during this collision. e) [3] Determine the coefficient of restitution for this collision. (Note: Since B is at rest initially, the given final direction of B defines the line of impact and hence normal direction.)

Answer 1

ter Collision sec Line impact 12 im pact Both pueki ase identicl,&0 mass of eaeh puck be m(l T2 ione of Momentum Ceservoton aon =m es,t m (5.b0) Cs8 A atha

fo puck A after Coltision So, 8, B37 122 41t37 L0.T S15 o.So VA tV VtSintss we enow that Sg.47 perpendiculon Compontut of puck A im Coltision does not SA (D.34) 21S A 2.1S Naw, veing 3.J15 o.

Emetic energy befove Collision of uck 2 2 Azter Collh sion metic neaa of Aane B 2 Loss in kinehe eveago = 50 ( 글께 (3-36)-(425+152)] . Loss mnehc Eney m(93) 2. JoO 31.36 Loss Cotie ent tTestitution= velocty of Sapayation eloty of apsoquh e e 3.3- (2.5(05 (5.60) (0-32) 2.65 05 s.I52 So, e equal to os