A) 20m
B) 80m
C) 170m
D) 40m
E) 160m
Correct Answer: B
Solution :
\[{{s}_{1}}=\frac{1}{2}gt_{1}^{2}=\frac{10}{2}\times {{(5)}^{2}}=125\,m\] \[{{s}_{2}}=\frac{1}{2}gt_{2}^{2}=\frac{10}{2}\times {{(3)}^{2}}=45\,m\] \[\therefore \] \[{{s}_{1}}-{{s}_{2}}=125-45=80\,m\]
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