Newton’s first law of motion is an object in motion stays in motion, an object at rest stays at rest unless acted upon by an outside force. When your container hits the ground it is acted upon by an outside force. An external force is required to set the egg into motion. When you fill your container with what ever material you use you are trying to get that material to absorb the difference in force between what the egg can withstand and the actual force being exerted. The egg shell can absorb a certain amount of force before breaking.
Newton’s second law of motion states the acceleration of an object depends on its force and mass. The force acting on the egg is equal to its mass multiplied by the acceleration brought in it by gravity. If your container was heavier in mass it would accelerate faster, and if it was lighter it would accelerate at a slower speed. When the egg is falling the unbalanced force is causing the egg to accelerate, the unbalanced force is gravity.
Newton’s Third law of motion states for every action there is an equal and opposite reaction. When the container lands the reaction will happen at the same time but in the opposite direction so when the container lands, and upward force will act on it. My container in particular I filled it with jelly. The egg isn’t touching any side of the container so when it drops the energy is dispersed into the jelly. For example in a car accident the