Homework Help: 3Dvectors ?

1. Sep 18, 2005

Mimi

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......?

Is this 3D vector question? What formulas should I use for finding these values?? Please help...

2. Sep 18, 2005

yourdadonapogostick

what is R0?

3. Sep 18, 2005

neurocomp2003

position...i'm assuming its find r1

4. Sep 18, 2005

yourdadonapogostick

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

5. Sep 19, 2005

Mimi

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

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