A) 4
B) 5
C) 2
D) 3
Correct Answer: D
Solution :
[d] Let s be the thickness of plank and a the retardation. Then | |
\[r\text{ }\alpha \text{ }{{n}^{2}}\] | ....(1) |
and \[\upsilon \text{ }\alpha \text{ }\frac{1}{n}\] | ....(2) |
\[2as=\frac{7}{16}{{V}^{2}}\] | |
Substituting in Eq. (2) | |
\[n=\frac{{{V}^{2}}}{2as}=\frac{16}{7}=2.28\] | |
Thus number of planks required is 3. |
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