Kinematics Question 587

Question: The x and y components of A are 4 m and 6 m, respectively. The x and y components of (A+B) are 10 m and 9 m respectively. The magnitude of vector b is:

Options:

A) 19 m

B)27

C) 45

D)50

Show Answer

Answer:

Correct Answer: C

Solution:

[c] A=4i^+6j^.

If Bx and By are the components of vector along x and y axes, then 4+Bx=10, Bx=6 Also 6+By=9, By=3.

Thus, B=Bx2+By2=62+32=45.



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