March 12th, 2017, 12:58 PM  #1 
Member Joined: Feb 2014 Posts: 91 Thanks: 1  So I got this imaginary number... I don't think I did this question correctly but anyways what am I suppose to do with this number? Did I make a critical mistake and caused it to be imaginary? Is there more I can do? 
March 12th, 2017, 01:32 PM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,678 Thanks: 1339 
one mistake I see is in line #5 ... h = 100 cm = 0.1 m. If the ball is sliding without rolling, then $v_f = \sqrt{v_0^2  2gh}$ ... so, is the ball rolling or not? 
March 12th, 2017, 03:46 PM  #4 
Math Team Joined: Jul 2011 From: Texas Posts: 2,678 Thanks: 1339  

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imaginary, number 
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