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Raindrop free falling -- calculate the velocity and time

  • #1

Homework Statement


Raindrops fall from a broken gutter at 1.0 s intervals to the ground , 19.6 m below

Neglecting air resistance and taking g as 9.81 calculate


  1. the time for each drop to reach the ground
  2. velocity of the drops as they reach the ground
  3. speed of drop at the height of 14.7 m
I would really be grateful if someone could telll me if my answers are right and help me with an approach to nr 3)

Homework Equations




The Attempt at a Solution


  1. t= sqrt of (s/(U+0.5a))
  2. sqr.2x9.81x19.6
  3. I dont know how to approach this
 
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Answers and Replies

  • #2
rude man
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Homework Statement


Raindrops fall from a broken gutter at 1.0 s intervals to the ground , 19.6 m below

Neglecting air resistance and taking g as 9.81 calculate


  1. the time for each drop to reach the ground
  2. velocity of the drops as they reach the ground
  3. speed of drop at the height of 14.7 m
I would really be grateful if someone could telll me if my answers are right and help me with an approach to nr 3)

Homework Equations




The Attempt at a Solution


  1. t= sqrt of (s/(U+0.5a))
  1. what is U here?
    [*]sqr.2x9.81x19.6
    ok
    [*]I dont know how to approach this
    you found the speed at 19.6m; do the same for 14.7m. But be careful: it says at a height of 14.7m, not 14.7m below the gutter!
[/QUOTE]
 

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