Question

if a=3m , b=4m how will you combine them to get a resultant vector of (a) 1m (b) 7m and (c) 5m.​

Answer 1

Answer:

when angle between the two vectors is 0 then we simply add the vectors

therefore to get resultant 7m we will assume that the two vectors are moving in same direction and the angle between the two vectors is zero

2) if angle between 2 vectors is 180 then we subtract the two vectors so resultant would be 1m

3) if angle between two vectors is 90 then

r = \sqrt{ {3}^{2} } + {4}^{2} + 2 \times 3 \times 4 \times \cos( \alpha )r=

3

2

+4

2

+2×3×4×cos(α)

since cos90 =0

therefore

r = \sqrt{9 + 16}r=

9+16

r = \sqrt{25}r=

25

r = 5r=5

Answer 2

Answer:

A) = 180

B) = 0

C) 90

Explanation: