9.40.Model:The billiard balls will be modeled as particles. The two balls, 1m(moving east) and 2m(moving west), together are our system. This is an isolated system because any frictional force during the brief collision period is going to be insignificant. Within the impulse approximation, the momentum of our system will be conserved in the collision. Visualize:Note that 12.mmm==Solve:The equation fixxpp=yields: () () () ( )1f2f1i2i1212xxxxmv+=+( ) ()()11
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