Issue with Ball-to-Ball Collision Simulation

Hello,

This is an elementary question.

I am simulating a sphere-on-sphere collision in Isaac Sim, and I would like to know the procedure for setting the initial velocity of the spheres.
When I define the velocity using the “Property” setting, it stays constant throughout, and after the spheres collide, they do not behave as expected and merge.
(Gravity is set to 0)

I would appreciate any advice or solutions to fix this issue.

Thank you in advance!

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Isaac Sim Version

4.2.0

Windows 11