Recall that

At its maximum height
, the toy will have 0 vertical velocity, so that


For the toy to reach this maximum height, it takes time
such that

which means it takes twice this time, i.e.
, for the toy to reach its original position.
The velocity of the toy when it falls 1.0 m below its starting point is



where we took the negative square root because we expect the toy to be moving in the downward direction.