document.write( "Question 1188917: An object is propelled upward from 12 meters above ground with an initial velocity of 120 meters/second.
\n" ); document.write( "It's height can be modeled by the equation s(t)=-5t^2 +120t+12 meters, where t is time in seconds.
\n" ); document.write( "It's velocity can be modeled by the equation v(t)=-10t+120 meters/second, where t is time in seconds.
\n" ); document.write( "At what velocity did the object hit the ground? \n" ); document.write( "

Algebra.Com's Answer #820113 by ikleyn(52798) $\"\"$ $\"About$

You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( " This problem is to be solved in two steps.\r
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document.write( "(1)  First step is to solve this quadratic equation\r\n" );
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document.write( "         -5t^2 + 120t + 12 = 0\r\n" );
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document.write( "     to determine the time when the object will hit the ground.\r\n" );
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document.write( "(2)  The second step is to substitute the found value of \"t\" into the formula for the velocity the object will hit the ground.\r\n" );
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document.write( "This value will be negative, which means that the velocity is directed vertically down.\r\n" );
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