Final answer:
The ball will roll to number 30 if placed at points greater than 30 on an inclined plane. On a flat surface, it would require an external force for the ball to roll a numerical distance to 30.
Step-by-step explanation:
The question is based upon the principles of physics , especially the laws associated with gravity and rolling motion. To make the ball roll to 30, you would have to consider the slope and the friction of the surface on which it is placed. Therefore, if you are placing the ball on a plane that is not level, you would need to consider that the ball will roll down from higher values to lower values.
For example, if you place the ball at the position marked 35 on a slope, then it would roll downwards towards the position marked 30 assuming there is no friction to stop the motion. It could also start from positions greater than 30 and would stop when the inclination of the slope allows for gravitational balance at the number 30.
However, if you are placing it on a flat surface, the ball would not move unless acted upon by an external force as proposed by Newton's first law of motion. Therefore, a ball will not roll to 30 unless it is acted upon by some force or if it is placed on an inclined surface with the angle of inclination being sufficient to overcome the frictional force.
Learn more about Gravity and Motion