Question

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

• A. 3
• B. 4
• C. 5
• D. 8

Answer 1

Answer: (B)

4

Answer 2

Also

Here , A = 5,

$\therefore 5 = \sqrt { ( 3 ) ^ { 2 } + \mathrm { A } _ { \mathrm { y } } ^ { 2 } }$

Squaring both sides, we get