Acceleration,

$\overline{){\mathbf{a}}{\mathbf{=}}\frac{\mathbf{\u2206}\mathbf{v}}{\mathbf{\u2206}\mathbf{t}}}$

Newton's second law,

$\overline{){\mathbf{\Sigma F}}{\mathbf{=}}{\mathit{m}}{\mathit{a}}}$

$\mathit{a}\mathbf{=}\frac{\mathbf{(}\mathbf{0}\mathbf{.}\mathbf{2}\mathbf{-}\mathbf{0}\mathbf{.}\mathbf{0}\mathbf{)}\mathbf{}\mathbf{m}\mathbf{/}\mathbf{s}}{\mathbf{(}\mathbf{0}\mathbf{.}\mathbf{2}\mathbf{-}\mathbf{0}\mathbf{.}\mathbf{0}\mathbf{)}\mathbf{}\mathbf{s}}$

Scallops eject water from their shells to provide a thrust force. (Figure 1) shows a smoothed graph of actual data for the initial motion of a 25g scallop speeding up to escape a predator.

What is the magnitude of the net force needed to achieve this motion?

Express your answer to two significant figures and include the appropriate units.

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What scientific concept do you need to know in order to solve this problem?

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Based on our data, we think this problem is relevant for Professor Chu's class at UH.