A) 15 \[cm{{s}^{-1}}\] towards west
B) 15 \[cm{{s}^{-1}}\] towards east
C) 5 \[cm{{s}^{-1}}\] towards west
D) 5 \[cm{{s}^{-1}}\] towards east
Correct Answer: C
Solution :
Let velocity towards east be positive, then velocity towards west is negative. If v is the velocity of two lumps which are coalesced after collision, then from law of conservation of linear momentum \[{{m}_{1}}{{v}_{1}}+{{m}_{2}}{{v}_{2}}=({{m}_{1}}+{{m}_{2}})v\] \[10\times 20-10\times 10=20\times v\] \[\Rightarrow \] \[v=\frac{100}{20}=5\,cm{{s}^{-1}}\] Hence, 5\[cm{{s}^{-1}}\] towards west.
You need to login to perform this action.
You will be redirected in
3 sec
