document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1145938>Question 1145938</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A hammer was dropped from a Carpenter's pocket from a height of 300 ft building and falls towards the earth in a straight line.<BR>\n" );
document.write( "a)What is the average velocity during the time it is falling.<BR>\n" );
document.write( "b)What is the instantaneous velocity of the hammer when it hit 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 #767235 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=767235\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A hammer was dropped from a Carpenter's pocket from a height of 300 ft building and falls towards the earth in a straight line.<BR>\n" );
document.write( "a)What is the average velocity during the time it is falling.<BR>\n" );
document.write( "b)What is the instantaneous velocity of the hammer when it hit the ground?<BR>\n" );
document.write( "------------<BR>\n" );
document.write( "h(t) = -16t^2 + 300<BR>\n" );
document.write( "Impact is at h(t) = 0<BR>\n" );
document.write( "-16t^2 + 300 = 0<BR>\n" );
document.write( "t^2 = 300/16<BR>\n" );
document.write( "t =~ 4.33 seconds<BR>\n" );
document.write( "===============<BR>\n" );
document.write( "acceleration = 32 ft/sec/sec<BR>\n" );
document.write( "Speed at impact = 4.33*32 = 138.56 ft/sec<BR>\n" );
document.write( "=========<BR>\n" );
document.write( "Avg speed = 138.56/2 = 69.28 ft/sec </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );