Physics 271: Advanced Honors Physics I
Recitation #7
Fall 2017

61. Here you have two equations -- conservation of momentum and conservation of kinetic energy, and we have two unknowns that appear multiplied together. It's a bit more involved than for the previous problem to organize the solution and several different ways will work. One is to solve the momentum equation first for m2 in terms of v2f and subsitute for m2 in the kinetic energy equation. Simplify using a2-b2 = (a+b)(a-b).
(a) 99 g (b) 1.9 m/s (c) 0.93 m/s

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