A) \[27\text{ }m{{s}^{-1}}\]
B) \[3.7\text{ }m{{s}^{-1}}\]
C) \[54\text{ }m{{s}^{-1}}\]
D) \[37\text{ }m{{s}^{-1}}\]
Correct Answer: A
Solution :
[a] As the ball, \[m=10\text{ }g=0.01\text{ }kg\]rebounds after striking the wall \[\therefore \]Change in momentum\[=mv-(-mv)=2\text{ }mv\] Impulse = Change in momentum\[=~2mv\] \[\therefore v=\frac{\text{Impulse}}{2m}=\frac{0.54\text{ N s}}{2\times 0.01\text{ kg}}=24\text{ m}{{\text{s}}^{-1}}\]
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