An inelastic ball falls from a height of `100` metres. It loses `20%` of its total energy due to impact. The ball will now rise to a height of
A. 80 m
B. 40 m
C. 60 m
D. 20 m
A. 80 m
B. 40 m
C. 60 m
D. 20 m
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Correct Answer – A
Correct option (A) 80 m
Percentage loss of total energy = \(\frac{h_1-h_2}{h_1}\times100\)
20 = \((\frac{100-h_2}{100})\times100\)
20 = (100 – h2)
h2 = 100 – 20
h2 = 80 m