Question

vector question - class 11.​

Answer 1

Answer:

10√7

Explanation:

if we parallel shift f2 in such position that its tail intersects with the head of f1 then the angle between the 2 vectors is 120 degree.

now f2 - f1 = √f2² + f1² - 2f2.f1.cos 120      

= √20² + 10² - 2(20)(10)(-1/2)                           ( cos120 = -1/2 )

= √400 + 100 + 200

= √700

= 10√7

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