Question

two vectors of magnitude 2 N and 4 N are acting at an angle 60 degree find magnitude of resultant

Answer 1

Explanation:

use the formula of resultant =(2)²+4²+2x2x4 cos60

20+16x1/2

36x1/2

18

The answer of this question is root 18

Answer 2

Answer:

magnitude of resultant vector is given by

R^2 = A^2 + B^2 + 2ABcos theta

so

R^2 = 2^2 + 4^2 + 2*2*4 COS 60

r^2 = 4 + 8 + 16 cos 60

r^2 = 12 + 16 * 1/2    as cos 60 = 1/2

r^2 = 20

r = root 20

r = 2root 5

hope it will help you

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