A) 19.6 J
B) 4.9 J
C) 10 J
D) 9.8 J
E) None of these
Correct Answer: D
Solution :
If there is no air drag then maximum height \[H=\frac{{{u}^{2}}}{2g}=\frac{14\times 14}{2g\times 9.8}=10\,m\] But due to air drag ball reaches up to height 8 m only. So, loss in energy \[=mg\left( 10-8 \right)\] \[=0.5\times 9.8\times 2=9.8\,J\]
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