A) the momentum changes by\[mv\]
B) the momentum changes by 2\[mv\]
C) the kinetic energy changes by (1/2)\[m{{v}^{2}}\]
D) the kinetic energy changes by\[m{{v}^{2}}\]
Correct Answer: B
Solution :
Initial velocity \[{{v}_{1}}=v\] Final velocity \[{{v}_{2}}=-\,v.\] Initial momentum \[{{p}_{1}}=mv\] Final momentum \[{{p}_{2}}=m\,(-v)=-\,mv\] Change in momentum \[\Delta p={{p}_{1}}-{{p}_{2}}\] \[=mv-(-mv)\] \[=2\,mv\]You need to login to perform this action.
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