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Finding the resultant force - a crash test

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The sensor in the torso of a crash-test dummy records the magnitude of the net external force acting on it. If the dummy is thrown forward with a force of 130.0 N while simultaneously being hit from the side with a force of 4500.0 N, what force will the sensor report?

I would like the formula used to solve this problem and a detailed description on how you solved it. I am really lost on how to do any of it. Thanks!

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We have to use the Parallelgram law for the addition of forces. It states that two forces acting on an object may be ...

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