science
Grade-11
Easy

Question

Find the magnitude of vectors whose displacement is 15 m and 25 m, with the angle between them being 120 degrees.

  1. 20.1
  2. 25.5
  3. 21.7
  4. 22.6

hintHint:

Let R be Resultant and R= square root of A squared plus B squared plus 2 A B cos theta end root
w h e r e space theta space i s space a n g l e space b e t w e e n space v e c t o r s

The correct answer is: 21.7


    Let R be Resultant and R= square root of A squared plus B squared plus 2 A B cos theta end root
    w h e r e space theta space i s space a n g l e space b e t w e e n space v e c t o r s
    R equals square root of 15 squared plus 25 squared plus 2 cross times 15 cross times 25 cross times cos 120 end root space equals 21.7

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