How do I access a RigidBody's Velocity from the previous frame?

Unity Engine
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1

I want a GameObject to jump in the opposite direction at half of the current velocity after colliding with the ground, but at that point the velocity is already 0, so how do i store the previous velocity to use?

2

You can add a physics material to the ground and make it bouncy. If that’s too easy then you can use this:

	void OnCollisionEnter2D(Collision2D c)
	{
		c.otherRigidbody.AddForce(c.relativeVelocity * 0.5f, ForceMode2D.Impulse);
	}