# 3Dvectors ?

3Dvectors !?

Given; A=<3,-2,-4>m/s^2 , V0=<1,2,3>m/s, R0=<30,-80,40>m, T=8s.
Find; r0, V, Vave......?

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what is R0?

position...i'm assuming its find r1

Given; A=<3,-2,-4>m/s^2 , V0=<1,2,3>m/s, R0=<30,-80,40>m, T=8s.

duh, i should have looked at the units.....maybe i should get some sleep(it is 1:26am here)

well, i'd go with $$\vec{R}=\vec{R_0}+\vec{v_0}t+\frac{1}{2}\vec{a}t^2$$ to find r. you can use $$\vec{v}=\vec{v_0}+\vec{a}t$$ to find v. $$\vec{v}_{avg}=\frac{\vec{v}+\vec{v_0}}{2}$$ to find out avg velocity.

edit: yes, it is a 3-d vector question

So...should I break A, V0, and R0 into their components form (like A=2i-4j-3k) and plug them into the kinematics equations?