The golf ball will land first. All objects fall at the same speed, but that's in a vacuum. The ping pong ball has a huge amount of drag (which is air resistance) for its weight, so it will be slowed enough for there to be a visible difference.
Answer
The Golf ball will reach only a second or so before the ping pong ball. The chair will not be high enough for the ping pong ball to be considerably slowed due to air resistance.
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