Question

directions:

1. complete the description of the motion of each line segment.

practice problem #1
position vs. time
describe the speed and direction of object based on its graph.
describe the speed and direction of object based on its graph.

Explanation:

1. For the first segment (0 to 4 seconds): On a position-time graph, a horizontal line means position does not change over time. This indicates the object is not moving, so speed is 0, and there is no direction of motion.
2. For the second segment (4 to 10 seconds): A downward-sloping straight line on a position-time graph means the object is moving with constant speed toward the reference point (position 0). The slope is constant, so speed is steady, and the direction is decreasing position (toward the origin).

Answer:

1. Segment 0-4 seconds: Object is stationary (speed = 0 m/s, no direction of motion).
2. Segment 4-10 seconds: Object moves with constant speed toward position 0 (speed = $\frac{10\ \text{m}}{6\ \text{s}} \approx 1.67\ \text{m/s}$, direction: decreasing position).