Question

if two vectires A and B are normal to each other with A =3 and B =4,then magnitude of their resultant is​

Answer 1

Explanation:

Let

A

=3

i

^

and

B

=4

j

^

because both are perpendicular.

Now,

R=3

i

^

+4

j

^

Projection of

B

on

R

=

∣R∣

R

.

B

=

3

3

+4

2

(3

i

+4

j

).(4

j

)

=

5

16

=3.2