Physics, 01.04.2021 20:00, 7841784

A cart of mass m is moving with negligible friction along a track with known speed y, to the right. It collides with and sticks to a cart of mass 4m moving with known speed y, to the right. Which of the two
principles, conservation of momentum and conservation of mechanical energy, must be applied to determine
the final speed of the carts, and why?

A cart of mass m is moving with negligible friction along a track with known speed y, to the right.

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A cart of mass m is moving with negligible friction along a track with known speed y, to the right....