I guess you'd have to creat a player on collision with object event..
If you want the player to bounce of of the object, using the bullet behaviour as described above should work perfectly, if implemented right..
Another way would be to use any other kind of movement behaviour, or even code your own movement..
Just be sure to disable user input for the normal behaviour..
to push something on collision, you could add the pin behaviour..
Adding an is pinned, player set speed to 0.5 * the normal speed or something..
There are so many ways to achieve the wanted results, depending on your needs and wishes, you'd have to be more precise as to what you want and how your events are set up right now, to get a better explanation..