To analyze the graph described in the question, the relationship between acceleration (a) and force (F) can be understood through Newton's second law of motion, which states that \( F = ma \) (force equals mass times acceleration).
Given that the graph of acceleration versus force is a straight line with a y-intercept of zero, we know that:
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The slope of the line represents the mass of the motorboats, since \( m = F/a \) is rearranged from the equation \( F = ma \).
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A straight line passing through the origin (y-intercept of zero) indicates that the relationship between force and acceleration is linear, which further implies that a constant mass is shared among all motorboats.
Thus, from the information in the graph, we can infer that:
- All five motorboats have the same mass, which can be calculated from the slope of the line (mass = force/acceleration).
Therefore, the correct statement is:
All five motorboats have the same mass, which can be calculated from the graph.