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A car travels along a straight line at a constant speed of 60.0 mi/h for a distance d and then another distance d in the same direction at another...

A car travels along a straight line at a constant speed of
60.0 mi/h for a distance d and then another distance d in
the same direction at another constant speed. The average
velocity for the entire trip is 30.0 mi/h. (a) What is the constant
speed with which the car moved during the second
distance d? (b) What If? Suppose the second distance d
were traveled in the opposite direction; you forgot something
and had to return home at the same constant speed
as found in part (a). What is the average velocity for this
trip? (c) What is the average speed for this new trip

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