78. (Two cyclists that are 500 m apart start biking toward each other. They bike at speeds of 6 and 4 m/s. Velocity (m/s) a. How long does it take for them to reach each other? b. How far does the slower biker travel? Velocity vs. time 40 20 0 -20 -40 0 1 2 3 Time (s) 4 5 6 represents the Use the graph to 79. Velocity versus time graph for a ball thrown upwards calculate the maximum neigm te van reaches. 80. A runner passes the 2,000 m mark of a race 380 s after 86.

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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**Problem 78:**

Two cyclists that are 500 m apart start biking toward each other. They bike at speeds of 6 m/s and 4 m/s.

a. How long does it take for them to reach each other?

b. How far does the slower biker travel?

---

**Problem 79:**

*Graph Description:*

The graph is labeled "Velocity vs. time" and shows a line with a negative slope, indicating a decrease in velocity over time. The x-axis represents time in seconds (s), ranging from 0 to 6 s. The y-axis represents velocity in meters per second (m/s), ranging from -40 to 40 m/s.

This is described as the "Velocity versus time graph for a ball thrown upwards."

*Task:*

Use the graph to calculate the maximum height the ball reaches.

---

**Problem 80:**

A runner passes the 2,000 m mark of a race 380 s after starting. At what time (after starting) will the runner reach the 5,000 m mark if her speed remains constant?

---

**Problem 81:**

A submarine must reach a marker 290 km from shore 9 hr after leaving port. At what time will the submarine pass a marker that is 125 km from shore? Assume constant-velocity motion.

*Diagram Description:*

The diagram shows a path with two markers: "Marker 1" at 125 km and "Marker 2" at 290 km from the shore. A submarine is shown along the path between these markers.
Transcribed Image Text:**Problem 78:** Two cyclists that are 500 m apart start biking toward each other. They bike at speeds of 6 m/s and 4 m/s. a. How long does it take for them to reach each other? b. How far does the slower biker travel? --- **Problem 79:** *Graph Description:* The graph is labeled "Velocity vs. time" and shows a line with a negative slope, indicating a decrease in velocity over time. The x-axis represents time in seconds (s), ranging from 0 to 6 s. The y-axis represents velocity in meters per second (m/s), ranging from -40 to 40 m/s. This is described as the "Velocity versus time graph for a ball thrown upwards." *Task:* Use the graph to calculate the maximum height the ball reaches. --- **Problem 80:** A runner passes the 2,000 m mark of a race 380 s after starting. At what time (after starting) will the runner reach the 5,000 m mark if her speed remains constant? --- **Problem 81:** A submarine must reach a marker 290 km from shore 9 hr after leaving port. At what time will the submarine pass a marker that is 125 km from shore? Assume constant-velocity motion. *Diagram Description:* The diagram shows a path with two markers: "Marker 1" at 125 km and "Marker 2" at 290 km from the shore. A submarine is shown along the path between these markers.
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