document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=889349>Question 889349</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A ball is thrown upward with an initial velocity of 64 ft/sec from a height 960 ft. Its height h, in feet, after t seconds is given by h(t)=-16t2 +64t+960. After how long will the ball reach the ground ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #538101 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=538101\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A ball is thrown upward with an initial velocity of 64 ft/sec from a height 960 ft. Its height h, in feet, after t seconds is given by h(t)=-16t2 +64t+960. After how long will the ball reach the ground ?<BR>\n" );
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document.write( "ball will reach the ground when (h(t)=0<BR>\n" );
document.write( "-16t2 +64t+960=0<BR>\n" );
document.write( "-t^2+4t+60=0<BR>\n" );
document.write( "(-t+10)(t+6)=0<BR>\n" );
document.write( "t=-6(reject)<BR>\n" );
document.write( "or<BR>\n" );
document.write( "t=10<BR>\n" );
document.write( "After how long will the ball reach the ground ? 10 sec<BR>\n" );
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