document.write( "Question 1153455: NASA launches a rocket at t=0 seconds. Its height, in meters above sea-level, as a function of time is given by h(t)=−4.9t2+217t+185.
\n" ); document.write( "Assuming that the rocket will splash down into the ocean, at what time does splashdown occur?
\n" ); document.write( "The rocket splashes down after ________ seconds.
\n" ); document.write( "How high above sea-level does the rocket get at its peak?
\n" ); document.write( "The rocket peaks at __________ meters above sea-level. \n" ); document.write( "

Algebra.Com's Answer #775695 by ikleyn(52786) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "In my post, I only want to explain to the visitor, that the given equation DOES NOT describe the flight of a real rocket.\r\n" );
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document.write( "It describe the flight of a PROJECTILE, i.e. an object launched with the initial velocity of 217 m/s,\r\n" );
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document.write( "but then falling freely under the Earth's gravitation force.\r\n" );
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document.write( "The drag force, which provides vertical acceleration of a real rocket,  ABSENTS in the given equation (!)\r\n" );
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document.write( "So, it is not a real rocket (!) (!)\r\n" );
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document.write( "Such object has a common name \"a projectile\" in Physics.\r\n" );
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