A man (m₁= 90 kg) is standing on a railroad flat car that is 9.0 m long and of unknown mass m₂. The man and the car are initially at rest on a level track (Fig. P7.74A), and the wheels of the car are friction less. The man then runs to the opposite end of the car and the car moves a distance 1.5 m to the left (Fig. P7.74B). Estimate the mass of the car.

Figure P7.74

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A B