Question

please give me a clear explanation please show q 1o
8 with fig if possible please​

Answer 1

17) at least two non-zero vectors are require .
e.g A = (2i ) and B = -2i
A + B = 0 null vector

at least two coplanar vectors are require
example :- A = 2i + 3j and B = -2i -3j
A + B = 0

at least three unequal vectors are require. then resultant will be zero .
A = 2i + 3j , B = 3i -2j and C = -5i -j
A + B + C =0)


18) velocity of smoke = -velocity of train = -4i
so, net vel of smoke = -4i + 3j
so, net speed of snoke =√(3² +4²)
= 5m/s

19) use addition of two vectors formula ,
R = √( 3² +4² +2×3 × 4 cos∅)

for least value of R
cos∅ will be least but cos∅ ≥ - 1
so, so, cos∅ = -1 put

R = 1 unit

20) effective displacement of pandu = final position - initial position
= total length covered in east direction = 2+ 2 = 4 km

Answer 2

Answer:

17) at least two non-zero vectors are require.

e.g A = (2i) and B = -2i

A + B = 0 null vector

at least two coplanar vectors are require example :- A = 2i + 3j and B = -2i -3j A+B=0

at least three unequal vectors are require. then resultant will be zero. A = 2i + 3j , B = 3i -2j and C= -5i -j

A+B+C =0)

18) velocity of smoke = -velocity of train

=

-4i so, net vel of smoke = -4i + 3j

so, net speed of snoke =v(32 +4?)

= 5m/s

19) use addition of two vectors formula, R= V( 32 +4? +2×3 x 4 cos)

for least value of R cos will be least but cos Ø 2-1 so, so, cos Ø = -1 put

= 1 unit

20) effective displacement of pandu = final position - initial position = total length covered in east direction = = 2+ 2 = 4 km