Question 732052
The  equation of motion is:
{{{ h(t) = -16t^2 + 50 }}}
You want to know in how many seconds
the hammer will be at {{{ h(t) = 0 }}} ft,
which is the ground.
{{{ 0 = -16t^2 + 50 }}}
{{{ 16t^2 = 50 }}}
{{{ t^2 = 25/8 }}}
{{{ t^2 = 3.125 }}}
{{{ t = sqrt( 3.125 ) }}}
{{{ t = 1.77 }}} sec
answer:: (B)