when heavier left cart crashes with lighter right cart which is initially at rest, the lighter right cart gain acceleration and start moving.
This concept is based on conservation of momentum, Conservation of momentum is a major law of physics which states that the momentum of a system is constant if no external forces are acting on the system.
when heavier left cart crashes into the lighter right cart that is initially at rest, the right lighter cart will gain acceleration and start moving in the direction of motion of heavier cart and left heavier cart will remain in motion in the same direction.
learn more about conservation of momentum:
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