A) 10 km
B) 100 km
C) 1 km
D) 10 km
Correct Answer: C
Solution :
Horizontal speed of aeroplane \[\upsilon =360\,\text{kmph}\] \[=\frac{360\times 1000}{3600}\text{m}{{\text{s}}^{-1}}\] \[=100\,m/s\] Now, \[s=ut+\frac{1}{2}g{{t}^{2}}\] \[\Rightarrow \] \[490=\frac{1}{2}\times 9.8{{t}^{2}}\] \[[\therefore \,4=0]\] \[\Rightarrow \] \[{{t}^{2}}=100\] \[\Rightarrow \] \[t=10\,\sec \] Distance travelled along ground \[BC=\upsilon t\] \[=100\times 10\] \[=1000\,\,m\] \[=1\,km\]You need to login to perform this action.
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