A glider on an air track carries a fl ag of length through
Chapter 2, Problem 2.110(choose chapter or problem)
A glider on an air track carries a fl ag of length through a stationary photogate, which measures the time interval td during which the fl ag blocks a beam of infrared light passing across the photogate. The ratio vd /td is the average velocity of the glider over this part of its motion. Suppose the glider moves with constant acceleration. (a) Is vd necessarily equal to the instantaneous velocity of the glider when it is halfway through the photogate in space? Explain. (b) Is vd equal to the instantaneous velocity of the glider when it is halfway through the photogate in time? Explain. 75.
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