What happens in a perfectly elastic collision between equal masses?

Block 2 stops completely and transfers all its velocity to block 1. This is the same physics behind Newton cradle. Set the Equal Mass preset and elasticity 1.0 to see this.

Is momentum always conserved in collisions?

Yes. Total momentum p1 plus p2 is conserved in every collision whether elastic or inelastic. Only kinetic energy changes with elasticity. Set elasticity to zero and watch KE drop while the momentum readout stays constant.

Colliding Blocks — Elastic and Inelastic Collisions

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Colliding Blocks