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261_Physics ProblemsTechnical Physics

# 261_Physics ProblemsTechnical Physics - Chapter 9 P9.31 The...

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Chapter 9 263 P9.31 The initial momentum of the system is 0. Thus, 1 20 10 0 . . m v m Bi a f b g = m s and v Bi = 8 33 . m s K m m m K m v m v m i f G B = + = = + = F H G I K J 1 2 10 0 1 2 1 20 8 33 1 2 183 1 2 1 2 1 20 1 2 1 2 183 2 2 2 2 . . . . m s m s m s m s 2 2 2 2 b g a fb g e j b g a fb g e j or v v G B 2 2 1 20 91 7 + = . . m s 2 2 (1) From conservation of momentum, mv m v G B = 1 20 . a f or v v G B = 1 20 . (2) Solving (1) and (2) simultaneously, we find v G = 7 07 . m s (speed of green puck after collision) and v B = 5 89 . m s (speed of blue puck after collision) P9.32 We use conservation of momentum for the system of two vehicles for both northward and eastward components.
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