## Question

###### Two identical pucks collide with coefficient of restitution e =0.8. Before impact, Va=7 m/s and Vb...

Two identical pucks collide with coefficient of restitution e =0.8. Before impact, Va=7 m/s and Vb = 3 m/s. Determine magnitude of velocity of each puck after impact. Define coordinate system. Determine component velocities of each puck after impact. Calculate two components of each velocity before impact. 2001

## Answers

solution 771 VB VBY 10 Bar MA= mg VA = 7 m/s NB= 3 m/s 20 WAY Z VAR (VA)x, = 7C0320 -- 6.6 m/s (VA) y, 7 sin 20 = 2.4 m/s (UB), = 3 sin ao 1.02 m/s ((B) y, = 3cos 2o = 2.81 m/s Since y axis velocity will remain Same before & after collision in the direction of collision VAR + VBX2 e-0.8 - 6.6 +1.02 VABZ TVB 2 2 = 6.09 rysBalancing momentum 6.6m -1.02 m - -(m) (Vax_z) + (m VBx2) - Vboli - Voda = 5.58 from ① & ② Vodz = 5.58 + Vana = 6.096 – VAD2 => Vaar -0.25 8 mis VB x 2 = 5.838 m/s After impact VAR / 258 + 2.4 = 8:41 m/s Vot = 55.87+218) = 6.47 m/s

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