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What is the distance the car traveled

what is the average speed

displacement

average velocity

part of the solution:

for first 3 sec traveled 9 m/s and traveled 27m

then how do you find the constant velocity that the car traveled for 60 sec?

is it still 9m/s? if it is then it traveled 540m

then -15m/s for 3sec. or -15m

then is the constant velocity still 9m/s? If it is then it traveled 270m

If all of this is correct then the car traveled 792m

average speed= 8.25m/s

displacement = 792m

average velocity= 8.25m/s