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Got .542 as right answer. But why is Vb1 not negative in conservation of energy equation?Problem 15.47 The 35-Mg treight car A and 20-Mg freight car Bare moving towards each other with the velocities shown Figure 1) Part A Determine the maximum compression ot the spring mounted on car Л. Neglect rolling resistance. Express your answer to three significant figures and include the appropriate units max438 Im Submit Figure 1 of 1 X Incorrect; Try Again; 3 attempts remaining Provide Feedback 20 km/h 10 km/h

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