Questions: Бие даалт 17... Бие даалт 17 1. https://phet.colorado.edu/en/simulations/collision-lab линкээр нэвтэрнэ. 2. 1D хэлбэрийг сонгоно. 3. Дараах өгөгдлүүдийг өгч 2 биеийг харимхай мөргөлдүүлнэ. 4. Мөргөлдсөний дараах 2 биеийн хурд хэд болсон бэ? 5. Моментумын өөрчлөлт хадгалагдах уу? Яагаад? 6. Импульс ямар болсон бэ? 7. 2-р биеийн хурд яагаад 0 болсон бэ? Шалтгааныг тайлбарлана уу?

Steps 4-7 require specific data that is not provided in the original prompt. The prompt asks for the final velocities of the balls, whether momentum is conserved, the impulse, and why the second ball's velocity is zero. These values depend on the initial conditions (masses and velocities) that were meant to be provided in step 3 but were missing from the given text. Therefore, I cannot provide a numerical answer to those steps. However, I can say that in a perfectly elastic collision in 1D, momentum _is_ always conserved. Impulse would require the time duration of the collision. The second ball's velocity would only be zero after the collision under specific initial conditions (e.g., equal masses, one initially at rest).