An object is thrown straight up with an initial velocity Vi. The graph represents the object’s vertical displacement as a function of time. Use the graph to the right, at what time the object reaches its maximum height?

Two students, student 1 and student 2, are discussing the graph shown above, which shows the vertical component of the velocity of the box from when it leaves the ramp to immediately before it hits the floor. The students make the following statements. Student 1: This graph shows that the vertical acceleration of the box is constant, and that the box’s speed decreases for the entire time shown. Student 2: The area between the graph and the time axis is the box’s vertical displacement, but the graph is incorrect because the positive displacement should be equal to the negative displacement. The angle of the ramp is changed such that it is larger than θ but less than 90 degrees, while the height of the end of the ramp remains the same. (h) How would the maximum height of the box compare to the original scenario in which the ramp angle was equal to θ ? Justify your ans

Stuck need help! Problem is attached. please view attachment before answering.  Really struggling with this concept. Please explain so I can better understand ! Thank you so much