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Question

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?

A
3
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B
4
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C
5
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D
8
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Solution

The correct option is C 4
A=Ax^i+Ay^j

Also A=A2x+A2y

Here A=5, Ax=3

5=(3)2+A2y

Squaring both sides we get
25=9+A2y

A2y=259=16

or Ay=4

1077777_938600_ans_39451b51936042928337456cde7cf026.png

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