A vehicle that utilizes a liquid-chemical rocket is to be used for escape of a payload of...

A vehicle that utilizes a liquid-chemical rocket is to be used for escape of a payload of 100,000 kg from the earth. The vehicle is to have two stages, each with ϵ = 0.06 and Isp = 400 s, and both having the same structural coefficient λ. Estimate the total mass of the vehicle. Assume as a first approximation that  and that drag effects are negligible. To ensure acceptable launch acceleration (say 0.2 ge), what restriction must be placed on the burning period for the first stage?