Q. In a two-dimensional elastic collision, which of the following is conserved?

द्वि-आयामी लोचदार टकराव में, निम्नलिखित में से क्या संरक्षित है?

Only energy
केवल ऊर्जा

Only momentum in x-direction
केवल x-दिशा में संवेग

Momentum in all directions and energy
सभी दिशाओं और ऊर्जा में गति

Only direction
केवल दिशा

In a 2D elastic collision, the following are conserved:

Momentum in both x and y directions, because no external forces act.
Kinetic energy, because the collision is elastic.
Hence, both momentum in all directions and energy are conserved.

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