A) \[\text{3 }km/h\]
B) \[\text{4 }km/h\]
C) \[\text{5 }km/h\]
D) \[{{10}^{-6}}{{m}^{2}}\]
Correct Answer: B
Solution :
For co planarity, \[\left| \begin{matrix} 2 & -1 & 1 \\ 1 & 2 & -3 \\ 3 & P & 5 \\ \end{matrix} \right|=0\] \[2(10+3P)+1(5+9)+1(P-6)=0\] \[20+6P+5+9+P-6=0\] \[7P+34-6=0\] \[7P+28=0\] \[7P=-28\] \[P=-\frac{28}{7}\] \[P=-4\]You need to login to perform this action.
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