8. Instantaneous velocity. A bird is flying due cast. Its distance from a tall building is given by x(t) = 28.0m +(12.4m/s)t- (0.0450m/s³)t³ . What is the instantaneous velocity at t = 8.0s. Derivatives: if e is constant and n is an integer (1,2,3,4,5,6 ...): d dt d -c=0 47 11-1
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