Kinematics Question 134

Question: The magnitude of a given vector with end points (4, ? 4, 0) and (? 2, ? 2, 0) must be

Options:

A) 6

B) 52

C) 4

D) 210

Show Answer

Answer:

Correct Answer: D

Solution:

r=r2r1=(2i^2j^+0k^)(4i^4j^+0k^)

therefore r=6i^+2j^+0k^

|r|=(6)2+(2)2+02=36+4=40=210



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