Question

bernie is practicing the 100-meter dash on the straight portion of his school’s track. he sprints 100 meters from the starting line, turns around, and sprints 100 meters back. which graph could show bernie’s distance from the starting line over time? two graphs: top graph with y - axis \distance from start (m)\, x - axis \time (sec.)\ and a purple line; bottom graph with same axes and a purple line

Explanation:

Step1: Analyze the motion

Bernie starts at distance 0 (start line), sprints 100m away (distance increases with time), then sprints back to start (distance decreases back to 0 with time).

Step2: Evaluate the graphs

• First graph: Starts at some distance, then goes to max, then stays? No, he returns to start.
• Second graph: Starts at 0 (time=0, distance=0), increases to 100m (distance from start), then decreases back to 0 (returns to start). This matches his motion.

Answer:

The second graph (the one with the triangle - shaped line starting at the origin, going up to a peak, then down to the x - axis) shows Bernie's distance from the starting line over time.