A college student launches a water balloon from the balcony of a building. The balloon's height off of the ground is a function of the amount of time after it is launched and is described bythe equationh(t) = -16t² + 40t + 72where t is time since launch in seconds and h(t) is the height in feet.Question: When will the balloon reach 60 feet above the ground?Enter your final answer rounded to the nearest tenth (one decimal place.).Enter the correct units for your answer in the second box.IF there is no valid answer enter N/A in all blanks.Answer: The balloon reaches 60 feet afterWhy is there only one valid answer?