A) 256 J
B) 486 J
C) 524 J
D) 324 J
Correct Answer: B
Solution :
According to law of conservation of linear momentum \[{{m}_{A}}{{v}_{A}}={{m}_{B}}{{v}_{B}}\]= \[18\times 6=12\times {{v}_{B}}\]Þ \[{{v}_{B}}=9\ m/s\] K.E. of mass 12 kg, \[{{E}_{B}}=\frac{1}{2}{{m}_{B}}v_{B}^{2}\] = \[\frac{1}{2}\times 12\times {{(9)}^{2}}=486J\]You need to login to perform this action.
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