So let us work backwards from 50gs. I will be applying metric, so we multiply by 9.eight m/s to obtain 490 m/s as the deceleration we have to get. Now we need a commence speed, stop speed, and time it will take to slow down. As claimed before, I will be making use of 17 km/s for Original speed, and for an close speed I will use 0 km/s so we deliver