Question

If two vectors 3A and 4B which 1 point
are in same direction are added
together then their resultant is
given by?
o
A.3A + 4B
B.4A + 3B
O C.3A-4B
O D. None of above​

Answer 1

Answer:

ans A=B

Explanation:

The angle α which the resultant R makes with A is given by

tanα=

A+Bcosθ

Bsinθ

or

cos(θ/2)

sin(θ/2)

=

A+Bcosθ

2Bsin(θ/2)cos(θ/2)

which gives A+Bcosθ=2Bcos

2

(

2

θ

)

or A+B[2cos

2

(

2

θ

)−1]=2Bcos

2

(

2

θ

)

A=B