Question

(99 Points) In the Position versus Time Graph of an object moving in a straight line, does the graph show acceleration during the interval from time equals two hours to time equals three hours?

Answer 1

No, the object is not accelerating because acceleration occurs if the object has a change in speed or direction. 

Answer 2

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.