A) 24.7 m
B) 19.8 m
C) 9.8m
D) 4.9m
Correct Answer: C
Solution :
From Newtons second equation of motion, we have \[s=ut+\frac{1}{2}g{{t}^{2}}\] where u is initial velocity, t is time, s is displacement, and g is the acceleration due to gravity. Since, gravity attract every body towards its centre, downward direction is taken as positive and upward negative. Hence, \[s=ut+\frac{1}{2}g{{t}^{2}}\] \[=(-4.9\times 2)+\frac{1}{2}\times 9.8\times {{2}^{2}}\] \[=9.8+19.6=9.8\,\,m\]
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