For object C to have the same change in velocity as object A, the force that acts on object C must also be halved here.
We define the term acceleration as the change in the velocity of an object with time. We know that one of the effects of the force is that it causes a body to accelerate or to change its velocity.
Now, in this case, we can see that the force is directly proportional to the acceleration of the object thus when we half the force, the change in the velocity is also halved.
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