Question

1.
The magnitude of vector A = 5i+j-2k is
a) square root of 30
b)square root of 22
c) 2
d) square root of 10​

Answer 1

Answer:

a) square root of 30

Explanation:

as we know The magnitude of vector is given by

[(coefficient of i)^2 + (coefficient of j)^2 + (coefficient of k)^2]^1/2

magnitude of vector A = 5i+j-2k=(25+1+4)^2=30^1/2

Answer 2

Ex 10.2, 10 Find a vector in the direction of vector