The answer is A. According to the graph, the speed of the object during the time interval t = 2.0 seconds to t = 4.0 seconds is 10 m/s. Motion is a topic commonly talked about and explored in physics. Motion is when an object changes in position over a certain period of time.
The study of physics uses algorithms and math to predict motion and deceleration. Physics can mathematically measure motion with finding amounts for velocity, time, acceleration and many other measurements. Being able to measure motion is critical to understanding the universe.