How to get a Rotation looking away from a Vector3?

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#1

What I am asking is the same thing that happens in explosions. The object impacted by the blast is sent in the direction facing away from the explosions center based on its rotation around the explosions center.

#2

It’s really simple

local blastforce=10
part.Velocity=CFrame.new(pos1,pos2).LookVector * -blastforce