(Note: In Problems, assume a number like 6.4 is accurate to ? 0.1; and 950 is ? 10 unless 950 is said to be ?precisely? or ?very nearly? 950, in which case assume 950 ? 1. See Section 1?4.)
(I) A rolling ball moves from x1= 8.4 cm to x2= -4.2cm during the time from t1 = 3.0 s to t2 = 6.1 s. What is its average velocity over this time interval?
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