A ball is dropped from a height of 900 centimetres. Each time it rebounds, it rises to two-third of the height it has fallen through. The total distance travelled by the ball before it comes to rest in metres, is
A
27
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B
36
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C
18
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D
45
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Solution
The correct option is D45 H=9 metres
Total distance travelled by ball before it comes to rest is H+2[23H+(23)2H+(23)3H+⋯upto∞] =H+2H[23+(23)2+(23)3+⋯upto∞] =H+2H⎛⎜
⎜
⎜⎝231−23⎞⎟
⎟
⎟⎠ =H+4H=5H =5×9=45 metres