A) \[-80\hat{k}\]
B) \[\left( 10\hat{i}-16\hat{j} \right)\]
C) \[-40\hat{k}\]
D) \[40\hat{k}\]
Correct Answer: A
Solution :
Angular momentum \[L=m(v\times r)\] \[2kg\left( \frac{dr}{dt}\times r \right)=2kg(4tj\times 5i-2{{t}^{2}}\hat{j})\] \[=2kg(-20t\hat{k})=2kg\times -20\times 2{{m}^{-2}}{{s}^{-1}}\hat{k}\]\[=-80\hat{k}\]You need to login to perform this action.
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