1.

Vector A has a magnitude of 10 units and makes an angle of 30° with the positive X-axis. Vector B has a magnitude of 20 units and makes an angle of 30° with the negative X-axis. What is the magnitude of the resultant between these two vectors ?

Answer»

`20sqrt(3)`
35
`15sqrt(3)`
`10sqrt(3)`

SOLUTION :Angle between two vectors is 120°
`:.R=sqrt(A^(2)+B^(2)+2ABcos120^@)`
`sqrt(300)=10sqrt(3)`


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