All Junior Cert Mathematics posts
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    Problem solving Aniboh

    A ball is dropped 128 metres from the roof of a building. Suppose that

    with each bounce, the ball goes up exactly half its previous height. A man

    is sitting at his desk on the second floor. How many times will he see the

    ball if his eye level is 15 metres above the ground?

    Can anyone help?

    1. avatar image

      Sd0401

      6 times

    2. avatar image

      Jj_4790

      Wrong its 4 times 😅

    3. avatar image

      JMoore

      The sequence of heights of the ball dropped from the roof of the building is: 128m, 64m, 32m,16m, 8m, 4m, 2m, 1m, 1/2m, 0,25m, 0.125m, 0.00625m.......

      Therefore a man sitting on the second floor with his eye level 15m above the ground will see the ball 4 times.

    4. avatar image

      Sd0401

      No its actually 8 times because he will de the ball going up and down

    5. avatar image

      Sd0401

      *see

    6. avatar image

      Aniboh

      Thank you guys for the help

    7. avatar image

      Me

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