Alright this may be a simple and stupid question but I'm still not sure of what the answer might be :( So I hope you guys can help me out a little. =] Question: A swimmer dives off a raft in a pool. Does the raft rise or sink in the water? What happens to the water level in the pool? Give reasons for your answer. Attempt to find an answer: So, the raft was already floating in the water with the swimmer on it. Meaning the total mass is less than or equal to the upthrust due to atmospheric pressure. If the swimmer jumps off of the raft then there would be less force to act against the upthrust therefore the raft will rise. However, for the second part I am unsure. At first, I thought that the water level would reduce because less water is being displaced. But then for some reason I thought that the water level might be the same? Because the swimmer is not diving off out of the pool but he is still in the pool. I don't know I'm quite confused with this part of the question.