A) 3 km/h
B) 4 km/h
C) 5 km/h
D) 12 km/h
E) 8 km/h
Correct Answer: C
Solution :
Ist case: \[{{\left( 3\times \frac{5}{18} \right)}^{2}}={{0}^{2}}+2\times 10\times h\Rightarrow h=\frac{5}{144}m\] IInd case: \[{{v}^{2}}={{\left( 4\times \frac{5}{18} \right)}^{2}}+2\times 10\times \frac{5}{144}\] \[\Rightarrow \] \[v=5\times \frac{5}{18}m/s=5\,km/h\]
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