Gravity Question (I think) with mass and speed

[Sarim Rune]

So here is the theory question that I have to understand so that I can eventually solve the actual question.

A body with a mass of X tonnes is moving at Y Ln/h. What would the vertical height of that body be before coming to rest.

I'm presuming that this is a gravity question.

Now I'm using SI so I know to convert the mass to kg and the Length/Time to m/s.

After that, I don't quite get how I could figure out at what point in the air the mass goes before gravity brings it to a stand still.

Help?

 

[Simon Bridge]

A body with a mass of X tonnes is moving at Y Ln/h. What would the vertical height of that body be before coming to rest.

moving vertically?

After that, I don't quite get how I could figure out at what point in the air the mass goes before gravity brings it to a stand still.

... draw the velocity-time graph of the motion - you know initial and final speeds, you don't know the time so just leave it as a variable T. What shape is the graph? What kind of motion is this? In general - if you want to understand the motion, draw the graph.