Earth's gravity accelerates a falling object, whether it is a skydiver or a dropped glass, at a rate of nearly 10 meters per second. This means that aftr 10 seconds the object would be travelling at 100 metres per second or 360km/h.
Of cours, gravity is not the only force acting on a falling object. The faster an object goes through the air, the more the air resists it. Eventually the force of gravity and the air resistance balance each other out and the object stops accelerating. When this happens the object has reached its final speed, or terminal velocity. Terminal velocity depends on how much air resistance an object has-- for a skydiver it is around 190km/h.
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