Galileo did his experiments on inclined planes with smooth surfaces and observed that:

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The smoother the surface, the farther the ball travels

The rougher the surface, the farther the ball travels

The smoother the surface, the lesser the ball travels

The ball travels the same distance on smooth and rough surfaces

answer is A.

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Detailed Solution

Galileo did his experiments on inclined planes with smooth surfaces and observed that the smoother the surface, the farther the ball travels.

By observing the motion of objects on an inclined plane Galileo deduced that objects move with a constant speed when no force acts on them.

Galileo said that if the inclinations of the planes on both sides are equal then the marble will climb the same distance that it covered while rolling down. If the angle of inclination of the right-side plane were gradually decreased, then the marble would travel further distances till it reaches the original height. If the right-side plane were ultimately made horizontal (that is, the slope is reduced to zero), the marble would continue to travel forever trying to reach the same height that it was released from.