science
Grade-11
Easy
Question
The component of vector A=2i+3j and B=i+j
- 3.57
- 14.1
- 7
- 3
Hint:
3.57
The correct answer is: 3.57
A = 2i + 3j; B = i + j;
|B| = √( 1² + 1²) = √2
A.B = (2i + 3j).(i + j) = 2+3 = 5
Component of vector A along vector B
|X| = A.B/|B|
X = 5/√2 = 3.5355
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