Question

A 1000kg rocket is set vertically on its launching pad. The propellent is expelled at the rate of 2kg/s. Find the minimum velocity of the exhaust gases so that rocket just begin to rise. Also find rocket's velocity 10second after ignition, assuming the minimum exhaust velocity.
bobpursley
Are you in calculus? The calculus problem here is that you have a constant pushing force (mg) however, the mass of the rocket is constantly decreasing mass=(1000-2t)g so acceleration is the inverse of that, which is not linear, and you have to integrate over the time 0 to 10 to find vfinal.
Let me know.