Q. A ball is dropped from a height of 20 m. If the coefficient of restitution is 0.9, what will be the height attained after the first bounce?
1) 1.62 m
2) 16.2 m
3) 18 m
4) 14 m
Answer:
2) 16.2 m
Solution:
Ball is dropped from a height, h= 20 m
coefficient of restitution = 0.9
Height after the first collision, h’ = e2h
= (0.9)2 x 20
= 16.2 m