prob_078 - 78 REASONING Newtons second law Equation 4.2a...

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78. REASONING Newton’s second law, Equation 4.2a, can be used to find the tension in the coupling between the cars, since the mass and acceleration are known. The tension in the coupling between the 30 th and 31 st cars is responsible for providing the acceleration for the 20 cars from the 31 st to the 50 th car. The tension in the coupling between the 49 th and 50 th cars is responsible only for pulling one car, the 50 th . SOLUTION a. The tension
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