A large spacecraft is made up of several stages'. Each stage consists of a rocket motor and a fuel tank once a stage has used all its fuel the rocket

motor in that stage slows dwn .. the stage then disconnects form the spacecraft and falls back to earth As the rocket is rising due to the upward force of the first stage, an astronaut feels himself-pushed further and further back, compressing the back of his seat.S When the first stage shuts down, the astronaut is suddenly projected forwards by the seat. The astronaut is held in place by a safety strap. Explain the effects experienced by the astronaut. You may assume the force provided bu the first stage rocket motor is the moment it shuts down