Question

10. If P = 6i+8j and Q = 4i- 3 j then calculate
(i) Unit vector along P +2Q ​

Answer 1

Answer:

(14i + 2j) / 2√ 10

Explanation:

P + 2Q = 6i + 8j + 2(4i -3j)

= 6i + 8j + 8i - 6j

= 14i + 2j

Unit Vector = 14i + 2j / |14j + 2j|

= (14i + 2j) / √ ( 14^2 + 2^2)

= (14i + 2j) / √ (196 + 4)

= (14i + 2j) / 2√ 10