A) 64
B) 128
C) 144
D) 288
Correct Answer: D
Solution :
Applying the principle of conservation of momentum \[Mv=m{{v}_{1}}+{{m}_{2}}{{v}_{2}}\] \[0=4\times {{v}_{1}}+8(-6)\] \[4{{v}_{1}}=48\] \[\therefore \] \[{{v}_{1}}=12m/s\] Kinetic energy of other piece of 4 kg is given by \[=\frac{1}{2}\times 4\times {{(12)}^{2}}=288\,J\]You need to login to perform this action.
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