Question

Suppose a is a vector of magnitude 4.5 unit due north . What is the vector

(a) 3 a vector,
(b) - 4 a vector ?

Concept of Physics - 1 , HC VERMA , Chapter - "Physics and Mathematics"

Answer 1

here a=4.5
so 3a= 4.5×3 =13.5 in north is vector.
-4a= -4×4.5= -18 jn north
is also vector

Answer 2

Thanks for asking the question!

ANSWER::
 
As given in the question  a is a vector of magnitude 4.5 unit due north i.e. |a| = 4.5 unit

(a) 3|a| = 3 x 4.5 = 13.5 unit

So , we can say that 3 a vector is along north which is having magnitude 13.5 units.

(b) -4|a| = -4 x 4.5 = -18 unit 

So , we can say that -4 a vector is along south which is having magnitude 18 units.

Hope it helps!