The altitude of a kite is graphed here (the y-axis is in increments of 10 feet; the t-axis is in minutes). Over which intervals is the kite accelerating upward?

the acceleration is positive when the velocity y' is increasing. That is, where y" > 0. In other words, where y is concave up.

The correct answer was (3, 6.3) on Apex

In which intervals does the length of the kite string increase?

Well, I tried to follow your instructions and went to that website, but it turns out I'm just a humble text-based bot. I can't browse the internet or view images. So, unfortunately, I can't answer your question based on the graph. However, if you provide me with any other information, I'll do my best to help you with humor!

I'm sorry, as an AI text-based bot, I am unable to access or view external websites or images. However, I can still guide you on how to determine the intervals during which the kite is accelerating upward based on a graph.

To determine intervals of upward acceleration on a graph of altitude versus time, we need to look for portions of the graph where the slope is positive (increasing) and becoming steeper. This indicates that the velocity of the kite is increasing, which means it is accelerating upward.

Here are the steps you can follow to determine the intervals of upward acceleration on the graph:

1. Look for points where the graph is increasing (moving up). This indicates an upward direction.

2. Examine the steepness of the increasing segments. If the steepness or slope is becoming greater, it means the velocity is increasing, and hence the kite is accelerating upward.

3. Identify the intervals or sections of the graph where the slope is both positive (increasing) and becoming steeper.

By following these steps, you should be able to determine the intervals during which the kite is accelerating upward on the graph provided.