June 01, 2009

Maths Challenge #7 – How Deep is the Well?

I drop a rock down a well, and it takes 6s to reach the bottom. If gravity is 10m/s², how deep is the well?


- 5 comments by 1 or more people Not publicly viewable

  1. Daniel Corne

    30? Assuming it starts from rest…

    01 Jun 2009, 12:02

  2. Simon Whitehouse

    180m Using Newton’s Third Equation of Motion and u=0 you end up with s=1/2*10*6^2=180

    01 Jun 2009, 12:34

  3. Daniel Corne

    Woops forgot the power of two… =/

    01 Jun 2009, 16:09

  4. Eleanor Lovell

    There were a few mixed answers to this one but the actual answer is 180m.

    The formula needed to find out the depth is one of Newton’s laws of motion…

    s = \frac{1}{2}g{t^2}

    So…

    s = \frac{1}{2}g{t^2} = \frac{1}{2} 10{(6)^2} = 180 metres

    02 Jun 2009, 12:37

  5. free textures

    Far too smart for me!

    03 Jun 2009, 13:24


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