A) 0.15 m/s
B) 1.5 m/s
C) - 0.15 m/s
D) None of the above
Correct Answer: C
Solution :
[c]| MI of figure (ii) is smaller hence acceleration is greater. |
 |
| Initial linear momentum of system |
| \[={{m}_{A}}{{\vec{v}}_{A}}+{{m}_{B}}{{\vec{v}}_{B}}=0.2\times 0.3+0.4\times {{v}_{B}}\] |
| Finally both balls come to rest |
| \[\therefore \] final linear momentum = 0 |
| By the law of conservation of linear momentum |
| \[0.2\times 0.3+0.4\times {{v}_{B}}=0\] |
| \[\therefore \] \[{{v}_{B}}=-\frac{0.2\times 0.3}{0.4}=-0.15\,\,m/s.\] |
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