Kinematics Question 144

Question: If a unit vector is represented by 0.5i^+0.8j^+ck^ , then the value of c is [CBSE PMT 1999; EAMCET 1994]

Options:

A) 1

B) 0.11

C) 0.01

D) 0.39

Show Answer

Answer:

Correct Answer: B

Solution:

Magnitude of unit vector = 1
therefore (0.5)2+(0.8)2+c2=1

By solving we get c=0.11



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