A rocket initially at rest on the ground accelerates

Question

Compute all parts of following problem:

Problem: A rocket, initially at rest on the ground, accelerates straight upward with a constant acceleration of 30.0 m/s², until the fuel is used up after 10.40 s.

Part A: What is the speed of the rocket at that moment? (Neglect air resistance.)

Part B: From the time the fuel runs out, how long does it take for the rocket to reach its maximum height? (Use g = 9.8 m/s²)

Part C: What is the speed of the rocket when it hits the ground?

I need help to find the speed of the rocket when it hits the ground.