54. The following graph describes an airplane's distance from its last point of rest. s(1)A (20, 10,000) 10,000 8000 6000 4000 2000 - (6, 1000) o 2 4 6 8 10 12 14 16 18 20 Time (in seconds) a) Is the plane's velocity greater at t = 6 sec or t = 20 sec? How can you tell? b) Is the plane's acceleration positive or negative? How can you tell? Distance (in meters)

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