A) 1.0m
B) 4.2 m
C) 6.1 m
D) 9.8 m
Correct Answer: C
Solution :
[c] Let t be the time taken by the bullet to hit the target. |
\[\therefore \]\[700m=630m{{s}^{-1}}t\]\[\Rightarrow \]\[t=\frac{700m}{630m{{s}^{-1}}}=\frac{10}{9}\sec \] |
For vertical motion, |
Here, u = 0 |
\[\therefore \]\[h=\frac{1}{2}g{{t}^{2}}\] \[=\frac{1}{2}\times 10\times {{\left( \frac{10}{9} \right)}^{2}}\] |
\[=\frac{500}{81}m=6.1m\] |
Therefore, the rifle must be aimed 6.1 m above the centre of the target to hit the target. |
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