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1. The velocity of a car is recorded every 10 seconds, as shown in the table below. t ( sec) O 10 20 30 40 50 60 70 v(t) (ft/sec) 4 12 22 38 50 57 59 60 A. Explain the meaning of v(1) di in terms of the car's travel. Use correct units. B. Evaluate v(1)di using a left-hand approximation with n=4. C. Evaluate v(1)di using a midpoint approximation with n= 3