document.write( "Question 889348: A projectile is launched from ground level with an initial velocity of v0 feet per second. Neglecting air resistance, its height in feet t seconds after launched is given by s= -16t^2+v0t. Find the time(s) the projectile will (a) reach a height of 192 feet (b) return to the ground when v0=128 feet per second. \n" ); document.write( "
Algebra.Com's Answer #538111 by Alan3354(69443)\"\" \"About 
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A projectile is launched from ground level with an initial velocity of v0 feet per second. Neglecting air resistance, its height in feet t seconds after launched is given by s= -16t^2+v0t. Find the time(s) the projectile will (a) reach a height of 192 feet (b) return to the ground when v0=128 feet per second.
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\n" ); document.write( "s= -16t^2+v0t
\n" ); document.write( "s(t) = -16t^2 + v0t
\n" ); document.write( "(a) reach a height of 192 feet
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\n" ); document.write( "s(t) = -16t^2 + 128t = 192
\n" ); document.write( "-16t^2 + 128t = 192
\n" ); document.write( "Solve for t, it's just a quadratic.
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\n" ); document.write( "-16t^2 + 128t = 0
\n" ); document.write( "Even easier.
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\n" ); document.write( "This aint rocket science. \n" ); document.write( "
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