Graphical Interpretation of Work: A force acts on an object, causing it to move parallel to the force. The graph in the figure shows this force as a function of the position of the object. How much work does the force do as the object moves from 0 m to 4 m?
A. 20 J
B. 30 J
C. 0 J
D. 40 J
E. 70 J
Answer: A
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How fast are they moving if their measured mean life is 1.1 
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