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Homework Help: Find speed using distance and acceleration?

  1. May 11, 2015 #1
    Hi everyone,
    hopefully someone hear can help me.

    a man jumps into a swimming pool from a height of 4.7m assuming that his downward acceleration is 9.8 m s2 due to gravity, at what speed does he enter the water.

    I really need help knowing what equations to use, i realise i need to work out the time taken and use that to calculate the overall speed but i am having trouble displaying that as i need to show all my workings.

    Thanks for your time.
  2. jcsd
  3. May 11, 2015 #2
    You could use the formula (distance)=(initial velocity)*t + (1/2)*(acceleration)*t^2 to find the time, using initial velocity = 0, acceleration = -9.8 and distance = 4.7.

    Then you could use the formula (final velocity)-(initial velocity) = (acceleration)*t, using the same acceleration and time. Dont forget the negative sign in both accelerations.

    Hope this helped.
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