# So I got this imaginary number...

#### The_Ys_Guy

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
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?

2 people

#### skipjack

Forum Staff
h = 1m

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

2 people

Math Team
1 person