Solve the all parts of given question:
Question: A 1000 kg weather rocket is launched straight up. The rocket motor provides a constant acceleration for 16 s, then the motor stops. The rocket altitude 20 s after launch is 6200 m. You can ignore any effects of air resistance.
Part I: What was the rocket's acceleration during the first 16s?
Part II: What is the rocket's speed as it passes through acloud 6200 m above the ground?
I want you to explain the physics in this question.