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in Physics by (57.1k points)
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

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3 Answers

0 votes
by (41.2k points)
Correct Answer - A
0 votes
by (15 points)
20% energy is lost that means 80% still remains so by that

80% mgh
the mass is not given assume to be 1 kg

80/100mgh = 0
therefore 
h =100mg/80
0 votes
by (44.0k points)

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

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