On a day with no wind, a large object is dropped from a tall building. The object experiences air resistance during its fall to the ground. State and explain, in terms of the forces acting, how the acceleration of the object varies during its fall.

As the object is released two forces act on it.Its weight and and air resistance. At this point its weight is much greater due to the force of gravity on the object so it accelerates downward. As its speed increases so does the drag on the object so its aceletation starts to slow down until it reaches zero. At which point air resistance will be equal to the weight of the object leaving a resultant force of zero.