document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=481436>Question 481436</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a stone is thrown vertically up with a velocity of 20m/s.<BR>\n" );
document.write( "determine <BR>\n" );
document.write( "A. the maximum height of the ball will reach to<BR>\n" );
document.write( "B. the time of flight of the ball<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #329659 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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/cgi-bin/show-face.mpl?user=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=329659\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a stone is thrown vertically up with a velocity of 20m/s.<BR>\n" );
document.write( "determine <BR>\n" );
document.write( "A. the maximum height of the ball will reach to<BR>\n" );
document.write( "B. the time of flight of the ball<BR>\n" );
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document.write( "What ball?  A stone was thrown??<BR>\n" );
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document.write( "You didn't give a function, so I'll use this one.<BR>\n" );
document.write( "Assuming the ball/stone starts at a height of zero:<BR>\n" );
document.write( "h(t) = -4.9t^2 + 20t + 0<BR>\n" );
document.write( "A. the maximum height of the ball will reach<BR>\n" );
document.write( "That's the vertex of the parabola, at t = -b/2a<BR>\n" );
document.write( "t = -20/-9.8<BR>\n" );
document.write( "t = 100/49 seconds, ~ 2.041 seconds<BR>\n" );
document.write( "h(100/49) = -4.9*(100/49)^2 + 20*100/49<BR>\n" );
document.write( "=~ 20.408 meters<BR>\n" );
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document.write( "B. the time of flight of the ball<BR>\n" );
document.write( "It's 2x the time in A, same time falling as ascending.<BR>\n" );
document.write( "= 200/49 seconds<BR>\n" );
document.write( "=~ 4.082 seconds<BR>\n" );
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