Question

on sunday, arianna jogged the pinecreek loop trail. she started out at a quick pace, but at about the halfway point she began to tire and gradually slowed down. which graph could show ariannas speed over time? graphs showing speed (mph) vs. time (min.) are present: first graph has a triangle, second has a curve decreasing after a flat start, third has an increasing curve, fourth has a curve increasing after a flat start

Explanation:

Step1: Analyze the description

Arianna started at a quick pace (constant or high initial speed), then at halfway, she began to tire and gradually slowed down. So the speed should be relatively high initially, then decrease gradually over time.

Step2: Evaluate each graph

• Top - left: Speed increases then decreases linearly. But she started at a quick pace, not starting from 0 and increasing. Eliminate.
• Top - right: Speed is high initially, then gradually decreases (curved line, showing gradual slowdown). Matches the description.
• Bottom - left: Speed is increasing over time. Contradicts the "slowed down" part. Eliminate.
• Bottom - right: Speed is constant then increases. Contradicts the "slowed down" part. Eliminate.

Answer:

The Top - Right Graph