The graph below shows the altitude, in feet, of a model rocket t seconds after launch. During this time, the rocket experiences three distinct modes of flight. Initially, the engine accelerates the rocket upward. The rocket then coasts upward, is slowed by gravity, and eventually begins to fall. Last, a parachute opens and the rocket drifts smoothly back to the ground.
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When was the model rocket 600 feet above the ground?
4.5 seconds
7 seconds
7 and 9.5 seconds
4.5 and 12 seconds

To determine when the rocket was 600 feet above the ground, we can analyze the graph.

### Steps to analyze the graph:
1. Look for the points on the graph where the altitude is 600 feet.
2. Identify the corresponding times on the x-axis (time in seconds) at which the rocket's altitude was 600 feet.

### Breakdown:
- The graph most likely shows the rocket's altitude as a function of time, with peaks and a descent due to the parachute.
- Based on the choices provided, we can infer that the rocket reaches 600 feet at two distinct time intervals (since more than one answer choice involves multiple time points).

From typical rocket flight behavior:
- The rocket could be at 600 feet during ascent (before coasting) and once again during descent (when falling under the influence of gravity or parachute).

Thus, **the most likely answer is "7 and 9.5 seconds"**, assuming the graph shows that the rocket was 600 feet at those times during its ascent and descent.

Would you like further clarification or a breakdown of how to interpret such graphs in general? 

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**Relative Questions:**
1. How can you determine time intervals from a graph?
2. What factors affect the shape of the altitude-time graph for a rocket?
3. How can the effects of gravity be seen in the graph of the rocket's flight?
4. What does the peak of the graph represent in a rocket's flight?
5. How would the graph change if the parachute did not deploy?

**Tip:** When analyzing a graph, always pay attention to the axis labels and units to better understand what the graph represents!

When was the model rocket 600 feet above the ground?
4.5 seconds
7 seconds
7 and 9.5 seconds
4.5 and 12 seconds

Explore how to interpret an altitude vs. time graph to determine when a model rocket reached 600 feet. Learn about the phases of rocket flight, including ascent, coasting, and descent, suitable for students in Grades 6-8.

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