A person drops an object from a plaza that is 729 feet tall. The height H of the object after T seconds is given by the equation H = -16t squared + 729. Find how many seconds pass before the object reaches the ground.

• after dropping the ball height is reducing according to the given equation
  when ball will reach the graound h=0
  i.e. -16t=-729;
  t=729/16 sec
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