Kinematics Question 580

Question: If the resultant of the vectors 3i^+4j^+5k^ and 5i^+3j^+4k^ makes an angle θ with x-axis, then cos90 it’s

Options:

A) 0.07

B)0.574

C) 0.111

D)0.123

Show Answer

Answer:

Correct Answer: B

Solution:

[b] The resultant vector=(3i^+4j^+5k^)+(5i^+3j^+4k^)=8i^+7j^+9k^

cosθ=882+72+92=0.574



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