Automobile A of mass 1100 kg collides at a traffic intersection with automobile B of mass 1400 kg. Just before the collision, automobile A was moving due east and automobile B was moving due south. After the collision, the two automobiles remain entangled while they skid, with locked wheels, until coming to rest. The speed of automobile A before the collision was 21 m/s. The length of the skid marks is 16 m, and the coefficient of kinetic friction between the tires and the pavement is 0.8. What is the speed of automobile B before the collision in units of m/s? (Take g = 9.8 m/s².) Answer:
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