A) 2 : 1
B) 1 : 2
C) 4 : 1
D) 1 : 3
Correct Answer: A
Solution :
[a] Let \[{{v}_{1}}\] and \[{{v}_{2}}\] be the velocities of the body just before the collision & and after the collision. \[{{v}_{1}}^{2}=\sqrt{2gh}=\sqrt{2\times 10\times 10};\] \[{{v}_{1}}=\sqrt{2}\times 10\] \[{{v}_{2}}^{2}={{\sqrt{2gh}}_{1}}=\sqrt{2\times 10\times 2.5};\] \[{{v}_{2}}=\sqrt{2}\times 5\] \[\therefore \] \[\frac{{{v}_{1}}}{{{v}_{2}}}=\frac{10\sqrt{2}}{5\sqrt{2}}=\frac{2}{1}\]
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