So I got this imaginary number...

Feb 2014
91
1




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?
 

skeeter

Math Team
Jul 2011
3,355
1,848
Texas
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?
 
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skipjack

Forum Staff
Dec 2006
21,478
2,470
h = 1m

If the ball is rolling and not sliding, use the method described in the solution to problem 10 here.
 
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