Question

describing constant motion x vs. t
position vs. time
describe the speed and
direction of object based on
its graph.
type here
position vs. time
describe the speed and
direction of object based on
its graph.
type here
position vs. time
describe the speed and
direction of object based on
its graph.
type here

Explanation:

1. For the first graph: A horizontal position-time graph means position does not change over time. Speed is the rate of position change, so it is 0, and there is no direction of motion.
2. For the second graph: A positive-sloping straight line means position increases steadily with time. The constant positive slope indicates constant speed, and the positive slope means motion in the positive direction (away from the starting point).
3. For the third graph: A negative-sloping straight line means position decreases steadily with time. The constant negative slope indicates constant speed, and the negative slope means motion in the negative direction (toward the starting point).

Answer:

1. The object has a speed of 0 m/s (it is stationary, with no direction of motion).
2. The object has a constant positive speed, moving in the positive direction (away from the origin).
3. The object has a constant positive speed, moving in the negative direction (toward the origin).