vectors

Question: Two forces ${\vec F_1} = 5\hat i + 10\hat j - 20\hat k$and ${\vec F_2} = 10\hat i - 5\hat j - 15\hat k$ act on a single point. The angle between ${\vec F_1}$and ${\vec F_2}$ is nearly



1) 30°
2) 45°
3) 60°
4) 90°
Solution: Explanation: Explanation
addition-subtraction-vectors

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