Question

A displacement vector, at an angle of 30° with y-axis
has a x-component of 10 units. The magnitude
of the vector is :
(A) 5.0
(B) 10
(C) 11.5
(D) 20​

Answer 1

Answer:

A B C is a rt angle angle a=90 degree and AC=10 AB=r

Explanation:

so, cos 60°= AC/BC. 1/2=10/r then r= 20 units