According to Newton's first law, the steel ball will be reluctant to stop and want to continue in the motion. What will happen is that, the steel ball will either take a parabolic motion forward or move with a great speed to hit the front end of the box
According to Newton's first law, an object which is at rest will continue to remain at rest or in motion in a straight line will continue to move in a straight line except an external force act on it.
That means if a body is at rest, the body will be reluctant to start moving. And when a body is in a motion, it will be reluctant to stop. This is known as inertia
A steel ball that is at one end of a box that is moving forward is already experiencing motion in a straight line. If the box suddenly stops, According to Newton's first law, the steel ball will be reluctant to stop and want to continue in the motion. What will happen is that, the steel ball will either take a parabolic motion forward or move with a great speed to hit the front end of the box just after the box stops.
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