Chapter 9261*P9.27(a)Using conservation of momentum, pp∑∑=chchafterbefore, gives4 0103 04 05 0103 03 04 0.......++=++−afbgbg bgbg bgbgkgkgm skgm skgm sv.Therefore, v= +2 24.m s , or 2 24.ms toward the right.(b)No. For example, if the 10-kg and 3.0-kg mass were to stick together first, they wouldmove with a speed given by solving13103 03 04 01kgkgm skgm sbgbgbg bgbgv=+−..., or v11 38= +.m s.Then when this 13 kg combined mass collides with the 4.0 kg mass, we have17131 384 05 0kgkgm skgm sbgbgbg bgbgv=+..., and v= +2 24.m sjust as in part (a). Coupling order makes no difference.Section 9.4Two-Dimensional CollisionsP9.28(a)First, we conserve momentum for the system of two football players in the xdirection (thedirection of travel of the fullback).90 05 000185..coskgmskgbgbgbg+=Vθwhere θis the angle between the direction of the final velocity
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