Question

A sounding rocket is to be launched vertically from the earth's surface. it is to be designed for a 350 kg payload that must not suffer an acceleration of 6 g during the burning period. maximum propellant mass is 1000 kg and the structural efficiency factor e = 0.1. the solid propellant rocket motor that will be designed for this vehicle is expected to have a specific impulse of 250 s. determine the maximum allowable burning period

Answer 1

it will be 4 second