Question

If I spacecraft seems to be Motionless in deep space is given some type of quick push what will happen

Answer 1

It will stay in motion unless an outside force slows it down.

Answer 2

Answer:

Will remain in motion until an external force is applied.      

Explanation:

According to Newton's first law of motion, a body continues to be in state of rest or motion, until and unless an unbalanced, external force acts on it.

In deep space, there is no external force. If a motionless spacecraft uses thrusters to give a push, the spacecraft will continue to be in motion until an unbalance external force acts on it again to stop it or increase its speed or change direction.