A) 21 m/s
B) 24 m/s
C) 26 m/s
D) zero
Correct Answer: A
Solution :
Velocity of the centre of mass \[{{v}_{CM}}=\frac{{{m}_{1}}{{v}_{1}}+{{m}_{2}}{{v}_{2}}}{{{m}_{1}}+{{m}_{2}}}\] \[=\frac{(150\times 20)+(30\times 25)}{150+30}\] \[=\frac{3750}{180}\] \[=21\,m/s\]
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