I would suggest the ease tween plugin (actually, its a behavior). On the collision, spawn your score sprite(which would have the ease tween behavior), and then ease tween would let you send it the direction you want and destroy it at a set time.
Sorry about all the edits, you would also generally get faster help if you post these questions in the "how to" forum.
http://www.scirra.com/forum/behavior-easetween_topic53288.html