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c2 Geometric progression Watch

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    Hey Ive come across this question and I have no idea how they got their answer and why they did it.

    A ball is dropped from a height of 2 metres. After each bounce it rebounds to a height 0.8 times the height that it reached after the last bounce.

    (ii)
    Find the total distance travelled by the ball before it comes to rest.

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    how did they derive this equation? 2+2sum infinite ... I understand the +2 part as thats the height it dropped from but otherwise I am confused.

    Thanks in advance for help
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    (Original post by Polioz)
    Hey Ive come across this question and I have no idea how they got their answer and why they did it.

    A ball is dropped from a height of 2 metres. After each bounce it rebounds to a height 0.8 times the height that it reached after the last bounce.

    (ii)
    Find the total distance travelled by the ball before it comes to rest.

    Name:  maths qestoins.jpg
Views: 54
Size:  27.3 KB

    how did they derive this equation? 2+2sum infinite ... I understand the +2 part as thats the height it dropped from but otherwise I am confused.

    Thanks in advance for help
    The ball rebounds after it hits the surface, it first goes up then moves down, hence it is 2 times the sum to inifinity, we need to consider both the motions, of it moving up as well as moving down.
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    The ball has to fall from the height it gets to aswell....
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    (Original post by raheem94)
    The ball rebounds after it hits the surface, it first goes up then moves down, hence it is 2 times the sum to inifinity, we need to consider both the motions, of it moving up as well as moving down.
    ahaa that makes sense thank you
 
 
 
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