Kinetic Energy from Velocity Vector

[AdkinsJr]

I just need to find the kinetic energy of a 3.00kg object moving with a velocity <6,-1> m/s. I should be able to take the dot product to find v-squared right? I find that v^2=37, multiply by 3, divide by 2, this gives 55.5 J, the book says 60.0 J. I can't figure out what the problem is.

 

[rock.freak667]

Your answer matches the correct method. Did the question ask for a certain degree of accuracy?

 

[AdkinsJr]

Your answer matches the correct method. Did the question ask for a certain degree of accuracy?

No, it just gives the velocity vector, and asks for the kinetic energy.