Answer:
The marble will travel in a straight line on the flat sheet and in a line curving toward the central mass on the curved sheet.
Explanation:
This is a translational motion of a circular sphere
It has two motion,
1. Rotational motion: this occur at the curve edge.
2. Translational: this occur at the center and it moves on a straight line.
The motion at the edge is control by centripetal force.
Any force or combination of forces can cause a centripetal or radial acceleration.
