Is It Uniform Acceleration When an Object Slides Down an Inclined Plane?

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An object sliding down an inclined plane experiences uniform acceleration, as indicated by a straight line on the velocity-time graph. This motion is not uniform, as the position-time graph shows a curve. The consistent slope of the velocity-time graph confirms that the acceleration remains constant throughout the motion. Therefore, the object’s acceleration is uniform. Understanding these concepts is crucial for analyzing motion on inclined planes.
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What type of motion is experienced by an object moving down an inclined plane?
uniform motion, uniform acceleration, or nonuniform acceleration?

its a curve on the postion-time graph and a straight line on the velocity-time graph.

i know its definitely not uniform motion..is it uniform acceleration?
 
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Yes it is.
 
If it is a straight line on the v-t graph, what can you deduce about its acceleration, using the definition of acceleration?
 
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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