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The figure below shows a plot of the speed of a person's body during a chin-up versus time.

src="/qa/attachment/10702564/" alt="download (12).png" />

t v

0.00 s 0.000 m/s

11 0.50 s 0.0879 m/s

1.00 s 0.176 m/s

1.50 s 0.198 m/s

2.00 s 0.000 m/s

All motion is vertical and the mass of the person (excluding the arms) is 50.1 kg

What is the magnitude of the average net force exerted on the body by the arms during the first time interval? Answer in units of N. 

download (12).png

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