Recent content by pyx

There has got to be a way to solve this. What about substitutions? Would that help any?

The rocket starts at 50 meters BELOW ground. Not above.

I am still completely lost. I need to know the height after 20 seconds, as well as the velocity at 20 seconds and 30 seconds and the acceleration of the first part. No idea. Every equation I use has 2 unknowns.

OK, with that I don't know s or a...so how do I solve that?

So 50m=0m/s(20s)+.5(a)(400s^2) 50m=0m+200s^2(a) 0.25m/s^2=a so a = 0.25m/s^2? That is a pretty slowly accelerating rocket... I didn't think that d=50m. The rocket starts 50 meters underground, I don't know the height after 20 seconds. How can d=50m?

Homework Statement A missile is launched from a silo 50m deep. After 20 seconds the engine stops, there is a 10 second period where the rocket is coasting straight up. At the end of this period, the rocket is 8000m above the ground. a) What is initial acceleration of rocket? b) What is...