Calculate Impact Speed of Ball Bearings Dropped in Shot Tower

[Kalie]

Ball bearings are made by letting spherical drops of molten metal fall inside a tall tower called a shot tower and solidify as they fall.
If a bearing needs 4.50 to solidify enough for impact, how high must the tower be?
What is the bearing's impact speed?

I got the answer for the first part correct it was 99.2
d=.5*9.8*4.5^2=99.2
but I am not sure how to approach the second part...

What is the bearing's impact speed?
I search all over but couldn't find an equation could someone help me with that.
All I need is the equation...thank you

 

[mezarashi]

Look for the kinematics equations. Given all the information you have, you actually have a choice on the equation you want to use.

How about the intuitive: final velocity = initial velocity + (acceleration x time)

 

[HallsofIvy]

Ball bearings are made by letting spherical drops of molten metal fall inside a tall tower called a shot tower and solidify as they fall.
If a bearing needs 4.50 to solidify enough for impact, how high must the tower be?
What is the bearing's impact speed?

I got the answer for the first part correct it was 99.2
d=.5*9.8*4.5^2=99.2
but I am not sure how to approach the second part...

What is the bearing's impact speed?
I search all over but couldn't find an equation could someone help me with that.
All I need is the equation...thank you

You know that v= -9.8 t m/s² and t= 4.5 s!