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Change in momentum and speed from force vs. time graphs

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A toddler kicks a 0.42kg soccer ball that is initially at rest. The net force on the ball over time is shown below.
What is the ball's speed at t=20ms?
Round answer to two significant figures.
Note that time is in ms.
  • 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