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HELP! HW10 Problem 6

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In this question, v1i=v2i (because v=sqrt(2gh), it doesnt matter the mass). So from elastic collision equations , I get v1f=v1i (because v1i=v2i, so the numerator and denominator are the same, m1+m2). Similarly, we get v2f=v2i, so the heights (for both blocks) after collision are exactly the same as the heights the blocks released. Webassign says that's wrong. Please HELP, THANKS.

asked Oct 26, 2013 in Intro College Physics by Will_White (1,010 points)

1 Answer

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Take a look at this answer: http://tutor.leiacademy.org/qa/index.php/62/hw-10-question-6?show=65#a65

Use the elastic collision equations there, you will find the final velocities -- pay attention to the directions (signs) of the velocities -- ||v_{2i}|| is in the negative x direction so you will need to put in a negative sign there. 

answered Oct 26, 2013 by PhysicsDude (21,750 points)
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