Calculating Stone Distance and Speed: Kinematics Problem Help

[lostfan176]

Homework Statement

A stone is dropped from the roof of a high building. A second stone is dropped 1.50 s later. How far apart are the stones when the second one has reached a speed of 11.0 m/s?

Homework Equations

kinematics

The Attempt at a Solution

i need help setting up the problem i don't know how

 

[cristo]

Well, work out the displacement of the first stone when it reaches 11m/s, then the displacement of the second stone at this time.

 

[lostfan176]

i got the displacement of the first one as 6.17 m how do i get the second one?

 

[cristo]

There's no way I can tell you you're right or not if I don't see your work! Try calculating the time when the stone reaches 11m/s. Then you can perhaps find the displacement of the second stone at this time.