Jet propulsion is used during deceleration of a spacecraft during descent to Earth. How is the velocity of the exhaust gases

Jet propulsion is used during deceleration of a spacecraft during descent to Earth. How is the velocity of the exhaust gases flowing in the system directed in relation to the descent vehicle?

As well as at the start – from the spacecraft down to the Earth. The difference is that at the start, the initial speed of the device is zero. Then she grows. And when braking, the velocity vector of the vehicle is directed in the direction opposite to the velocity vector of the vehicle at startup.