Resultant Force of 2 Forces on Particle P (3kg)

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To determine the resultant force on particle P, which has a mass of 3kg and is acted upon by two forces (6i+2j) and (3i-5j), one must calculate the vector sum of these forces. The resultant force F can be found by adding the corresponding components of the two forces. This results in F = (6+3)i + (2-5)j, simplifying to F = 9i - 3j. The solution is straightforward, confirming that the resultant force is simply the vectorial sum of the individual forces acting on the particle. Understanding this concept is essential for solving similar physics problems.
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A particle P od mass 3kg moves under the action of two constant forces (6i+2j) and (3i-5j). How can i work out the resultant force F? This question is worth one mark, so I assume there must be a very simple method, but I can't think of any. Please help
 
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The RESULTANT force is the (vectorial) sum of all (individual) forces acting upon the object...
 
oh right. Thank you.
 
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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