Current Attempt in Progress Consider the freight train in Figure below. Suppose 21 boxcars pass by in a time of 15.8 s and each has a length of 12.0 m.(a) What is the frequency at which each boxcar passes? (b) What is the speed of the train? - The time. for one car to pass is the period 7 Velocity = V -Wavelength = à (a) Number i Units (b) Number Units

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