The answer is they will reach the bottom at the same time.
Here's why:
* Ignoring Air Resistance: In a perfect scenario with no air resistance, the acceleration of an object down an inclined plane depends only on the angle of the incline and the acceleration due to gravity.
* Mass Doesn't Matter: The mass of the object doesn't factor into the equation for acceleration.
* Equal Acceleration: Both the cannonball and the marble will experience the same acceleration down the incline.
Why it might seem counterintuitive:
Our intuition often tells us that the heavier cannonball should be faster. However, the cannonball's greater mass means it has greater inertia (resistance to change in motion). While this inertia makes it harder to *get* the cannonball moving, it also means it's harder to *stop* it once it's moving.
Real-World Considerations:
In the real world, air resistance will play a role. The larger surface area of the cannonball will likely mean it encounters more air resistance, slowing it down slightly compared to the marble. However, in a scenario with minimal air resistance, they will be very close to reaching the bottom simultaneously.