document.write( "Question 94501: Hello, \r
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\n" ); document.write( "\n" ); document.write( "I need help solving this problem using the formula h=vt-16t^2:\r
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\n" ); document.write( "\n" ); document.write( "An object is fired into the air with a velocity of 72 feet per second. How many seconds will it take for the object to hit the ground?\r
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Algebra.Com's Answer #68828 by scott8148(6628)\"\" \"About 
You can put this solution on YOUR website!
the object hits the ground when h=0 ... this is also where the object starts; so t=0 is a solution\r
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\n" ); document.write( "\n" ); document.write( "0=72t-16t^2 ... factoring gives 0=16t(4.5-t) ... 0=16t and 0=4.5-t ... t=4.5
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