How to prevent RigidBody2D slowing down after collision?

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:bust_in_silhouette: Asked By congbinh75

I’m new to Godot and I have a question.

I’m trying on my project to make a simple PingPong game. I’m using KinematicBody2D to make the paddle and RigidBody2D to make the ball. When I run it, the ball is slowed down after hitting the outline and the paddle.

I’m searched the problem on google and found some solutions but those are from Godot 2 and I don’t know that there is any change in Godot 3.

Hope you guys can help me.