Man, this is another embarrasing question. A 1000kg 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 5100 m. You can ignore any effects of air resistance. First this question has no use for the 1000 kg because it's in a chapter before forces are introduced... or I think. a- What was the rocket's acceleration during the first 16 s? Well I know delta time... but nothing about position, nothing about initial or final velocity... What is the rocket's speed as it passes through a cloud 5100 m above the ground? It's acceleration is -9.8 in that second stage and I know delta time is 4 seconds (20-16) but with no velocity I don't know how to get any info here... I should be solving these easy questions with no problem.