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Velocity and mass from force vs. position graphs

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A horizontal net force F is exerted on an object at rest. The object starts at x=0m and has a speed of 4.0ms after moving 6.0m along a horizontal frictionless surface. The net force F as a function of the object's position x is shown below.
What is the mass of the object?
Round answer to 2 significant digits.
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi