Question 1145285
When ball hits the ground, {{{ h = 0 }}}
{{{ -5t^2 - 2t + 49 = 0 }}}
 {{{ t = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
{{{ a = -5 }}}
{{{ b = -2 }}}
{{{ c = 49 }}}
{{{ t = (-(-2) +- sqrt( (-2)^2-4*(-5)*49 ))/(2*(-5)) }}}
{{{ t = ( 2 +- sqrt( 4 + 980 ))/(-10) }}}
{{{ t = ( 2 - sqrt( 984 )) / (-10) }}}
{{{ t = ( 2 - 31.369 ) / (-10) }}}
{{{ t = 29.369 / 10 }}}
{{{ t = 2.937 }}}
The ball hits the ground in 2.94 sec
----------------------------------------
check the math & get a 2nd opinion if needed