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===Calculating Elastic Potential Energy===
{{#ev:youtube|https://www.youtube.com/watch?v=v7uBIR9RWe0}}
{| class="wikitable"
| style="height:20px; width:200px; text-align:center;" |A bow with a spring constant of 400N/m is stretched 0.5m with a force of 200N. Calculate the elastic potential store of the bow.