Kinematics Question 571

Question: If a unit vector is represented by $ 0.5\widehat{i}+0.8\widehat{j}+c\widehat{k}, $ then the value of c is

Options:

A) 1

B)$ \sqrt{0.8} $

C) $ \sqrt{0.11} $

D)$ \sqrt{0.01} $

Show Answer

Answer:

Correct Answer: C

Solution:

[c] $ \sqrt{{{0.5}^{2}}+{{0.8}^{2}}+c^{2}}=1 $ or$ c=\sqrt{1-0.89}=\sqrt{0.11} $



NCERT Chapter Video Solution

Dual Pane