Incomplete suvat question?

See below: I am given the initial velocity. I take the assumption gravity is the acceleration in this question.
I feel the question is incomplete though or I don’t understand it.
I don’t know how tall Robert is or the intial height it’s thrown, I’m only given two variables.

At maximum height, in a moment in time, the object is not accelerating upwards or downwards, so final velocity is 0.
Remember, we are finding displacement, the difference in height between initial and maximum in this case. The actual initial height value does not matter for this problem. For this question, you can ignore the ball falling down, as we are only interested in the ball going up.
Since I modelled initial velocity as positive, acceleration is negative as it is acting against the ball.
Use V^2 = u^2 + 2as.
When modelling problem, model in the direction of motion.

So in the question that states determine the height to which the vase will rise above its initial height, you were able to deduce that as its max height?
Are all physics question this confusing? Or are there assumptions that in unaware of?

It must be the max height, because if the "max height" is bigger then it can rise to a greater height above its initial value!
You're over-thinking this