PROBLEM 13.51 A 1400-kg automobile starts from rest and travels 400 m during a performance test. The motion of the automobile is defined by the relation x = 4000 In(cosh 0.03r), where x and t are expressed in meters and seconds, respectively. The magnitude of the aerodynamic drag is D = 0.35v, where D and v are expressed in newtons and m/s, respectively. Determine the power dissipated by the aerodynamic drag when (a) t = 10 s, (b) t = 15 s.

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