How Would I Make A Fling Tool

I want to make a fling tool with a cooldown, all you have to do is click an npc and it will slighting fling them or push them over. I’ve seen all the tutorials, but none of them work like how I’d like to. Please tell me how I’d be able to make this.

You can change the HumanoidRootPart’s Velocity. More information in this forum.