Answer on Mechanics | Relativity Question for pritesh
V = P2 - P1 = (2-1,2-2,4-3) = (1,0,1).
Let's normalize this vector so it's be the unit lenght:
|V| = √(1² + 0² + 1²) = √2;
V = (1,0,1)/√2 (now |V|=1).
Now we can multiple this vector by 20N to get final force vector:
F = 20V = 20(1,0,1)/√2.
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