Question

balancing his weigh
Q7. Find the vector AB and its magnitude if it has initial
point A (1,2,-1) and final point A(3,2,2).
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Answer 1

Answer:

A→=(3−1)Iˆ+(2−2)jˆ+[2−(−1)kˆ

=2Iˆ+0jˆ+3kˆ

=2Iˆ+3kˆ It means A→ lies in x-z plane .

∣∣∣A→∣∣∣=22+32−−−−−−√=13−−√

If θ is the angle which A→ makes with x-axis, then tanθ=32orθ=tan−1(32).

Explanation:

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