document.write( "Question 460356: A ball is thrown vertically upward from the top of a building 96feet tall with an initial velocity of 80feet per second. The distance S (in feet )of the ball from the ground, after t seconds is s=96+80t-16tsquard.
\n" ); document.write( "(a)After how many seconds does the ball strike the ground?
\n" ); document.write( "(b) After how many seconds will the ball pass the top of the building on its way down? \n" ); document.write( "
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A ball is thrown vertically upward from the top of a building 96feet tall with an initial velocity of 80feet per second. The distance S (in feet )of the ball from the ground, after t seconds is s=96+80t-16tsquard.
\n" ); document.write( "(a)After how many seconds does the ball strike the ground?
\n" ); document.write( "When s = 0 it hits the ground
\n" ); document.write( "s=96+80t-16t^2 = 0
\n" ); document.write( "-t^2 + 5t + 6 = 0
\n" ); document.write( "(-t + 6)*(t + 1) = 0
\n" ); document.write( "t = -1 second (Ignore)
\n" ); document.write( "t = 6 seconds to impact
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\n" ); document.write( "(b) After how many seconds will the ball pass the top of the building on its way down?
\n" ); document.write( "96+80t-16t^2 = 96
\n" ); document.write( "-t^2 + 5t = 0
\n" ); document.write( "t = 0 (at launch)
\n" ); document.write( "t = 5 seconds (on the way down)
\n" ); document.write( " \n" ); document.write( "
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