what is the acceleration of a baseball when its speed increases from 1 m/sec to 25 m/sec in 1 second?

We just started the introduction into circles and i have no idea how to do this.

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

You dug a hole that was 8 feet deep. after taking a short break, you dug down 3 more feet in the same hole. when finished digging, a tractor accidentally filled the hole with 4 feet of dirt. how deep is your hole now?