A) \[\hat{i}-\hat{j}\]
B) \[-\hat{i}+2\hat{j}\]
C) \[-\hat{i}-\hat{j}\]
D) \[2\hat{i}-\hat{j}\]
Correct Answer: B
Solution :
[b] \[\hat{j}\] component, i.e., component of velocity parallel to wall remains unchanged while \[\hat{i}\] component will become \[\left( -\frac{1}{2} \right)(2\hat{i})\] or \[-\hat{i}\]. Therefore, velocity vector of the sphere after it hits the wall is \[-\hat{i}+2\hat{j}\] .You need to login to perform this action.
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