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Hang-Gliding Instructor

Real-Life Activities

Real-Life Math -- Solution

  1. The wind is blowing up the slope at 10 miles per hour. Approximately how fast will you have to run down the slope to achieve liftoff?

    If there's no wind, you have to run 20 miles an hour.

    You take the speed of the wind and add the speed you must run in order to achieve 20 miles per hour.

    Running speed = 20 mph needed - 10 mph wind speed
    Running speed = 10 mph

    A wind blowing up the slope works in your favor. If the wind is blowing at 10 miles per hour, you'd only have to run about 10 miles an hour to achieve liftoff.

  2. The wind is blowing from behind at 10 miles per hour. How fast would you have to run to achieve liftoff?

    If the wind is at your back, that will make your launch more difficult. It's like working with a negative number. If it's blowing at 10 miles per hour from behind, you'd have to add a number that makes the equation equal 20 mph.

    Running speed = 20 mph needed - (-10 mph wind speed)
    Running speed = 20 + 10
    Running speed = 30

    You'd have to run 30 miles an hour! You better wait until the wind is just right.


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