Question

when a body falls freely under gravity then it moves with a constant?? ​

Answer 1

Body falls with acceleration 'g' due to gravity under the influence of gravitational force until the buoyancy force balances it. When the resultant force acting on the object becomes zero, it attains a velocity called terminal velocity. Mass is constant. And the gravity which is also constant.

Answer 2

Constant acceleration: 9.8 m/s^2