document.write( "Question 394017: Suppose Charlie O’Brian of the Braves hits a
\n" ); document.write( "Baseball straight upward at 150 ft/sec from a height of 5 ft.
\n" ); document.write( "a) Use the formula to determine how long it takes the ball
\n" ); document.write( "to return to the earth.
\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #279554 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
O’Brian of the Braves hits a Baseball straight upward at 150 ft/sec from a height of 5 ft.
\n" ); document.write( "a) Use the formula to determine how long it takes the ball
\n" ); document.write( "to return to the earth.
\n" ); document.write( "---
\n" ); document.write( "h(t) = -16t^2+150t+5
\n" ); document.write( "----
\n" ); document.write( "h(t) is zero when the ball in on the ground.
\n" ); document.write( "---
\n" ); document.write( "Solve: -16t^2+150t+5 = 0
\n" ); document.write( "---
\n" ); document.write( "t = [-150 +- sqrt(150^2-4*-16*5)]/(-32)
\n" ); document.write( "---
\n" ); document.write( "t = [-150 +- sqrt(22820)]/(-32)
\n" ); document.write( "---
\n" ); document.write( "Positive solution:
\n" ); document.write( "t = [-150-151.06]/(-32)
\n" ); document.write( "---
\n" ); document.write( "t = 9.408 seconds
\n" ); document.write( "======================
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
\n" ); document.write( " \n" ); document.write( "
\n" );