Projectile Problem Homework: CM, x(t) Equations

[Kitten207]

Homework Statement

Located here:

http://i54.tinypic.com/5vzkll.jpg

Homework Equations

CM = Σ(m_i)(x_i)

x(t)= x_o + (v_ox)t + ½(a_x)t²

The Attempt at a Solution

Do I have to break it up into components?

 

[Redbelly98]

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