Final answer:
When a constant net force is applied to an object and its mass is suddenly reduced by half while the net force remains constant, the object's acceleration will double according to Newton's second law of motion.
Step-by-step explanation:
If constant net force is applied to an object, and then suddenly its mass was reduced by half while the net force remains constant, the acceleration of the object will double according to Newton's second law of motion. Newton's second law states that acceleration (a) is directly proportional to force (Fnet) and inversely proportional to mass (m), as described by the formula a = Fnet/m. Given this relationship, when the mass is halved but the force stays constant, the ratio of force to mass is doubled, leading to twice the acceleration.