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what is the net force on this object?

Hello!

In this case, as the meanings of the vectors are opposite, one of the forces receives the negative signal. And to know the module of the resultant force, if it subtracts the modules of the forces.

B. 200N

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I Hope this helps, greetings ... Dexteright02! =)

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error