Question

A vector of magnitude 10 units in direction of 3i+4j is...
A) 5i+6j
B) 8i+6j
C) 6i+8j
D) 4i+3j

Answer 1

Your answer is

8i+6j

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Answer 2

R= magnitude X direction

= 10 X [(3i + 4j)/√(9+16)]

= 10 X [(3i+4j)/5]

= 10/5 X (3i+4j)

= 2 X (3i+4j)

= 6i + 8j

option C) is correct