document.write( "Question 630392: Q: A skydiver who jumps from a plane gains speed while falling. For one jump, altitude readings were made every ten seconds until the parachute opened. Known data includes:
\n" ); document.write( "Started at altitude of 500 meters; drops 70 meters every 10 seconds. I need to write an algebraic equation to represent the data showing the altitude at 65 seconds. I have already done the graph, analyzed the information and determined the altitude would be 45 meters at the 65 second mark. I have tried multiple formulas to represent the facts but in proving my equations, they are incorrect. I need to write this data in an algebraic equation, can you help? Thanks (in advance) \n" ); document.write( "
Algebra.Com's Answer #396887 by Alan3354(69443)\"\" \"About 
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A skydiver who jumps from a plane gains speed while falling. For one jump, altitude readings were made every ten seconds until the parachute opened. Known data includes:
\n" ); document.write( "Started at altitude of 500 meters; drops 70 meters every 10 seconds. I need to write an algebraic equation to represent the data showing the altitude at 65 seconds. I have already done the graph, analyzed the information and determined the altitude would be 45 meters at the 65 second mark. I have tried multiple formulas to represent the facts but in proving my equations, they are incorrect. I need to write this data in an algebraic equation, can you help?
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\n" ); document.write( "If the rate of falling is consistent at 70 m per 10 seconds, then that's the \"terminal velocity.\" Gravity's acceleration is balanced by air resistance, and the rate of falling is constant at 7 m/sec.
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\n" ); document.write( "Using 500 meters as a starting point,
\n" ); document.write( "h(t) = 500 - 7t, h in meters, t in seconds.
\n" ); document.write( "At t = 65,
\n" ); document.write( "h(65) = 500 - 455 = 45 meters
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\n" ); document.write( "If 500 meters is the altitude when he leaves the aircraft, there's an error due to the fact that it takes time to accelerate to the terminal velocity.
\n" ); document.write( "If 500 meters is where you start to take the measurment after reaching terminal velocity, then it's
\n" ); document.write( "h(t) = 500 - 7t
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