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Q.

The magnitude of the x-component of vector A→ is 3 and the magnitude of vector A→ is 5. What is the magnitude of the y-component of vector A→ ?

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a

3

b

4

c

5

d

8

answer is B.

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Detailed Solution

A→ = Axi^+Ayj^Also, A = Ax2+Ay2∴  5= 32+Ay2Squaring both side, we get 25  =  9+Ay2Ay2 = 25-9 = 16 or Ay = 4
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