document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=756054>Question 756054</A>: <I><SPAN STYLE=\"word-break: break-all;\"> When an object is released and falls freely, its height , h metres, above the ground after t seconds is represented by the relation h = -0.5t2g + d , where g is the acceleration due to gravity and d is the initial height of the object before it is released. Since the strength of gravity varies from planet to planet, the value of g is specific to each planet. \r<BR>\n" );
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document.write( "Suppose a rock is dropped from a height of 100 m on Mars and also on Venus.<BR>\n" );
document.write( "On Mars, g= 3.7m/s2 and on Venus, g= 8.9 m/s2. How long does it take the rock to fall to a height of 25 m on each planet ?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #459983 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=459983\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> When an object is released and falls freely, its height , h metres, above the ground after t seconds is represented by the relation h = -0.5t2g + d , where g is the acceleration due to gravity and d is the initial height of the object before it is released. Since the strength of gravity varies from planet to planet, the value of g is specific to each planet. \r<BR>\n" );
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document.write( "Suppose a rock is dropped from a height of 100 m on Mars and also on Venus.<BR>\n" );
document.write( "On Mars, g= 3.7m/s2 and on Venus, g= 8.9 m/s2. How long does it take the rock to fall to a height of 25 m on each planet ? <BR>\n" );
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document.write( "On Mars, g= 3.7m/s2<BR>\n" );
document.write( "h(t) = -1.85t^2 + 100 = 25<BR>\n" );
document.write( "t^2 = 75/1.85<BR>\n" );
document.write( "t =~ 6.367 seconds<BR>\n" );
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document.write( "Do Venus the same way.<BR>\n" );
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