The corect phase sequence shown
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In position time graphs, otherwise known as distance time graphs, acceleration/decceleration occurs when the line curves, which looks like the picture I've included.
In hours 2 to 3, the object does not accelerate, but instead stays at a constant speed of 20m per hour.
In hours 2 to 3, the object does not accelerate, but instead stays at a constant speed of 20m per hour.