Final answer:
In an idealized situation without air resistance, an object in freefall seems to be weightless and falls with a constant acceleration due to gravity.
Step-by-step explanation:
An object that is in freefall seems to be weightless because the only force acting on it is gravity. When the net external force on an object is its weight, which means air resistance and friction are negligible, we say that it is in free-fall. However, in the real world, objects are never in true freefall because they usually encounter some upward force due to air resistance or buoyancy. Nevertheless, in ideal situations without air resistance, all objects would fall with the same constant acceleration, which on Earth is 9.80 m/s2.