There is only acceleration if the car's velocity changes. If it moves at a constant velocity, then there is no acceleration.
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If the speed is constant at 50 mph, then the acceleration is 0.
My interpretation is that the car and any motion, like the graph, do not exist.
Oh, dude, so like, technically speaking, the car going from 60 mph to 70 mph has a larger acceleration because it's like speeding up by 10 mph, while the van only increases its speed by 15 mph. It's like comparing a sports car to a minivan, you know? But hey, either way, they're both just vehicles trying to get from point A to point B.
Acceleration is zero since 55 mph is velocity and it is constant. Acceleration is defined as the rate of change in velocity. The speed is the absolute value of velocity so it is also 55.
As long as the 30 minute are spent driving in a straight line, the acceleration is zero.