Algebra

The following graph models the height of a model rocket in feet measured over time in seconds.

a graph of a downward opening parabola. The x axis is labeled Time in seconds. The Y axis is labeled Height in feet. Points on the graph include starting point (negative 0.04, 0) (2.5, 103), and the ending point(5.04, 0).

How many seconds does it take for the rocket to reach the ground?

Enter your answer as a number, like this: 42.
Do not round your answer if it is a decimal.

I got the answer 2.54 from subtracting 2.5 from 5.04 because the seconds it takes to reach the ground cannot be negative which is why I didn't subtract 2.5 from 5.04 which equaled: -2.54. Unless it wants us to do addition which the answer would be 7.54 seconds.

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asked by Klauus
  1. no. You start measuring at time t=0
    It took 5.04 seconds for the height to reach zero.

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    posted by oobleck
  2. Wouldn't it take 5.08 seconds because it started at -0.004 seconds?

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    posted by Klauus
  3. do I need to repeat myself?
    nothing happens before t=0
    You launch the rocket, and 5.04 seconds later it lands.
    It was launched from some initial nonzero height.
    If it had been launched from the ground, it would have had to have happened 0.04 seconds earlier.

    But it didn't.

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    posted by oobleck

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