A) \[=\left[ 7\times 5+\frac{1}{2}4\times {{(5)}^{2}} \right]-\left[ 7\times 4+\frac{1}{2}4\times {{(4)}^{2}} \right]=25\ m\]
B) \[40\,m\]
C) \[20\,\,m\]
D) \[160\,\,m\]
Correct Answer: A
Solution :
\[h=\frac{1}{2}g{{t}^{2}}=\frac{1}{2}\times 10\times {{(4)}^{2}}=80\ m\]
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