Kinematics Question 298
Question: A force vector applied on a mass is represented as $ \vec{F}=6\hat{i}-8\hat{j}+10\hat{k} $ and accelerates with $ 1\ m/s^{2} $ . What will be the mass of the body in kg. [CMEET 1995]
Options:
A) - 2
B) 8
C) - 7
D) - 8
Correct Answer: D For perpendicular vector $ \overrightarrow{A}.\overrightarrow{B}=0 $
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Answer:
Solution:
therefore $ (5\hat{i}+7\hat{j}-3\hat{k}).(2\hat{i}+2\hat{j}-a\hat{k})=0 $
therefore $ 10+14+3a=0 $
$ \Rightarrow $ $ a=-8 $
