A) \[5\,m{{s}^{-1}}\]
B) \[10\,m{{s}^{-1}}\]
C) \[2.5\,m{{s}^{-1}}\]
D) \[7.5\,m{{s}^{-1}}\]
Correct Answer: B
Solution :
Here, \[{{u}_{1}}=10,\,{{m}_{1}}=m,\,\,{{m}_{2}}=m,\,\,{{u}_{2}}=0\] \[{{u}_{1}}=10m/s\] \[{{v}_{2}}=\left[ \frac{{{m}_{2}}-{{m}_{1}}}{{{m}_{1}}+{{m}_{2}}} \right]{{u}_{2}}+\frac{2{{m}_{1}}{{u}_{1}}}{{{m}_{1}}+{{m}_{2}}}\] \[=\frac{2\times m\times 10}{2m}=10m/s\] Similarly, for B and C \[\Rightarrow \] \[{{v}_{3}}=10m/s\]You need to login to perform this action.
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