In a place without air resistance, a uncrumpled piece of paper and a rock dropped at the same height, would land at the same time. Without air resistance, gravity is the force exerted on the two objects and they both have the same gravity.
With air resistance, the paper would land much later due to its surface area. Although air resistance is acting on both objects, the rock's surface area is smaller than the paper so there's less force slowing it down.
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