document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=255529>Question 255529</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A stone is thrown horizontally off a cliff with a velocity of 10 m/s. If it takes 5 seconds for the stone to hit the ground, how his is the cliff? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #187761 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=187761\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A stone is thrown horizontally off a cliff with a velocity of 10 m/s. If it takes 5 seconds for the stone to hit the ground, how his is the cliff?<BR>\n" );
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document.write( "The acceleration due to gravity is 9.8 meter/sec/sec<BR>\n" );
document.write( "Velocity = acc x time, v = at<BR>\n" );
document.write( "v at impact = 9.8*5 = 49 meters/sec<BR>\n" );
document.write( "The average v over the 5 seconds is 24.5 m/sec<BR>\n" );
document.write( "5*24.5 = 122.5 meters<BR>\n" );
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document.write( "Another method:<BR>\n" );
document.write( "Distance fallen = 4.9t^2 meters<BR>\n" );
document.write( "s = 4.9*5^2<BR>\n" );
document.write( "s = 122.5 meters<BR>\n" );
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document.write( "PS  The horizontal velocity is irrelevant unless it is sufficiently large that the curvature of the Earth is a factor.\r<BR>\n" );
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