How Do You Calculate Velocity from a Graph with Two Points?

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To calculate velocity from a graph with two points, first identify the coordinates of the points on the graph. The formula for velocity is the change in position divided by the change in time, which can be derived from the two points. It’s important to show your work, especially in an online quiz context, to demonstrate your understanding. Use the coordinates to calculate the differences in both position and time, then apply the velocity formula. This approach will help clarify your solution and ensure accuracy.
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I'll give you a tip. You know 2 points from your graph.
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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