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If the body is freely falling, this sum will remain constant.
Yes, mass is an intrinsic property of matter. However a freely falling object will experience no weight.
Velocity
The equation of motion is not modified. Net force = mass x acceleration, whether freely falling or not.
A freely body is the body which is freely falling under the force of gravity i.e. an acceleration of 9.8 m/s2
Freely falling bodies
It is a projectile falling with an acceleration equal to that of free fall. (an object falling in a vacuum at the earth's surface)
force and gravity
no force act on it
No characteristics of a falling body appear on the list provided with the question.
9.8 m/s2
the object's falling speed