Raindrop free falling -- calculate the velocity and time

[chemie726283]

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 don't know how to approach this

 

[rude man]

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 don't 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]