A) 25 cm
B) 12 cm
C) 9 cm
D) 5 cm
Correct Answer: D
Solution :
Key Idea: Bullet is fired from rest hence initial velocity is zero. Time taken by the bullet in covering the horizontal distance R is \[t=\frac{distance}{speed}=\frac{100}{1000}=0.1\,s\] During this time, the bullet falls down vertically a distance h. \[h=ut+\frac{1}{2}g{{t}^{2}}\] Given, \[u=0,t=0.1\,s,\,g=10\,m/{{s}^{2}}\] \[\therefore \] \[h=0+\frac{1}{2}\times 10\times {{(0.1)}^{2}}=0.05\,m=5\,cm\].You need to login to perform this action.
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