A) \[0.4m{{s}^{-1}}\]
B) \[0.1m{{s}^{-1}}\]
C) \[0.3m{{s}^{-1}}\]
D) \[0.7m{{s}^{-1}}\]
Correct Answer: D
Solution :
| [d] \[m=20\text{ }g,u=1\text{ }m/s,\text{v}=?\] |
| \[S=20\times {{10}^{-2}}m\] \[a=\frac{-2.5\times {{10}^{-2}}}{20\times {{10}^{-3}}}m/{{s}^{2}}\] |
| \[{{\text{v}}^{2}}={{u}^{2}}+2as\] |
| \[{{\text{v}}^{2}}=1-2\times \frac{2.5\times {{10}^{-2}}}{20\times {{10}^{-3}}}\times \frac{20}{100}\] |
| \[\text{v=}\frac{1}{\sqrt{2}}\simeq 0.7m/s\] |
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