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Mechanics: Force and Acceleration

On my last test, there is a question: an object with a mass of 5kg is acted upon by 4 separate forces that each have a magnitude of 10N. I understand that there could be different resulting accelerations of the object but i don't understand why or how which is why i got this answer wrong. In fact, i was totally lost. What are the resulting accelerations and how do i come to that conclusion...would i use the acceleration formula?

Solution Summary

Different aspects for the resultant force and acceleration are discussed. A good basic concept learning.