The discussion revolves around a projectile motion problem involving a model rocket that accelerates while its fuel burns for a specified duration. Participants are tasked with determining the maximum height the rocket reaches and the total time it remains in the air before landing.
Some participants have provided guidance on using specific equations and suggested breaking the problem into two distinct phases. There is an ongoing exploration of the implications of the fuel duration and the initial conditions of the rocket's launch.
Participants note potential ambiguities in the problem statement, particularly regarding the interpretation of the fuel duration and its effect on the rocket's trajectory. The original poster expresses uncertainty about the problem's requirements and timeline.
I'm not really understand this sentence from question, "Its fuel lasts for 10 sec" does it mean the time from the rocket start flying to hitting the ground. Or, other meanings...mfb said:Those formulas are all you need. Split the motion into two parts - the time where the fuel is burning and the free fall afterwards.
What are velocity and displacement after 10 seconds? What happens afterwards?
You can assume that the rocket starts on the ground, at rest, and accelerates perfectly vertical. A good problem statement would have made this clear, but whatever.
HTT said:I'm not really understand this sentence from question, "Its fuel lasts for 10 sec" does it mean the time from the rocket start flying to hitting the ground. Or, other meanings...
Thank you so much, I think I got it~.SteamKing said:Assume at t = 0, the rocket is on the ground, and the fuel is ignited. The rocket takes off and flies straight up. At t = 10 s, the fuel is exhausted and the rocket is no longer accelerating due to the burning of the fuel. What happens next?