The correct answer is: (b) It moves off in a straight line.
Work Step by Step
The correct answer is: (b) It moves off in a straight line. According to Newton's first law, if the net force on an object in motion is zero, then the object will continue moving in the same direction at the same speed. As soon as the ball leaves the astronaut's hand, the net force on the ball is zero. Therefore, the ball will continue moving in a straight line.