A) 20m
B) 40m
C) 80m
D) 160m
Correct Answer: C
Solution :
From law of motion \[s=ut+\frac{1}{2}g{{t}^{2}}\] where u is initial velocity, and g is acceleration due to gravity \[\therefore \] \[s=\frac{1}{2}\times 10\times {{(4)}^{2}}=80\,m\] \[(\because \,u=0)\]
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