A) 20 J
B) 30 J
C) 40 J
D) 10 J
Correct Answer: A
Solution :
Key Idea The energy lost due to air friction is equal to difference of initial kinetic energy and final potential energy. Initially body posses only kinetic energy and after attaining a height the kinetic energy is zero. Therefore, loss of energy = KE - PE \[\text{-}\] \[=\frac{1}{2}\times 1\times 400-1\times 18\times 10\] \[_{Z}^{A}X\xrightarrow[{}]{{}}{{\,}_{Z+}}_{1}^{A}Y+\beta _{-1}^{0}\]
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