Two spheres  and  B" id="MathJax-Element-149-Frame" role="presentation" style="position: relative;" tabindex="0"> B" id="MathJax-Element-18-Frame" role="presentation" style="position: relative;" tabindex="0"> B collide elastically in two-dimensional space. Sphere " id="MathJax-Element-150-Frame" role="presentation" style="position: relative;" tabindex="0">" id="MathJax-Element-19-Frame" role="presentation" style="position: relative;" tabindex="0"> has a mass of  and an initial velocity of (, while sphere  B" id="MathJax-Element-151-Frame" role="presentation" style="position: relative;" tabindex="0"> B" id="MathJax-Element-20-Frame" role="presentation" style="position: relative;" tabindex="0"> B has a mass of " id="MathJax-Element-152-Frame" role="presentation" style="position: relative;" tabindex="0">" id="MathJax-Element-21-Frame" role="presentation" style="position: relative;" tabindex="0"> and is initially at rest. The collision occurs along a line of impact defined by the vector \(\hat{n} ={ \hat{i} + \hat{j} \over \sqrt 2}\). Calculate the final speed of A after collision to the nearest integer.

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