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A puck of mass m, moving at a speed of ₁ collides with an identical mass
stationary puck. After the collision, one puck moves off at an angle ₁ with a
speed of V₁, and the other puck moves off at an angle 9₂ with a speed of V₂'.
a) What are the speeds ₁ and ₂ if ₁ + ₂ = 90°? Express your answers in terms
of V₁ and ₁.
b) Is the collision inelastic or (totally) elastic? Support your answer with a
calculation.

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