Increase of motion speed

Good morning everybody,
I have a little problem while doing a simple ainmation with Bongo.
I just want to move vertically one object; the motion works, but the problem is that speed is not costant…at first the object moves versy slowly, and it suddenly accelerates and goes very fast until the ending position.
I don’t know if there is any option or setting about this…anyone has some ideas?

Thanks in advance!

You can easily check the movement speed curve in the curve editor.
Please have a look at one of the following videos for more info:

Marika, thanks very much for your answer!
The first video solved my problem.