The object will not be able to accelerate perpendicular to direction of motion
Answer:
you are making an observation that uses numbers.
Explanation:
When the parachute deploys it increases the persons air resistance to (temporaily) greater than the force of weight. This causes them to decellerate. As they decellerate resistance decreases again until once again it balances out. Terminal velocity is reduced to a safe level, and landing without injury is possible.