https://imgur.com/a/K8XEYpP
The question in question is number 2.

The velocity must be 2, right? How would I go about getting a different number?

The time for the phone to get to the edge is 10 seconds, so that means they have to get there in 10 seconds, too. If they were to start immediately after they miss then they only need to be going the same velocity, right?

Where am I going wrong and how to get the right number?

Thank you for any replies

EdIt: i got it lol i used d=0.5at^2 my bad thanks yall lolol