A) 1.5kg
B) 5.5kg
C) 0.5 kg
D) 3.5kg
Correct Answer: A
Solution :
Key Idea: Momentum: remains conserved in the process. If no external force acts upon a system of two (or more) bodies then the total momentum of the system remains constant, Hence, momentum before collision = momentum after collision \[v=-2u\] Given, \[{{u}_{1}}=1\,m/s,\,\,{{u}_{2}}=0.05\,\,kg,\,{{v}_{2}}=30\,m/s\] \[\Rightarrow \] \[-\frac{1}{15}=\frac{1}{u}-\frac{1}{2u}=\frac{1}{2u}\] \[\Rightarrow \] \[u=-\frac{15}{2}=-7.5cm\]
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