Who among the following was the first to conclude that in vacuum all objects fall with the same acceleration g and reach the ground at the same time?

The correct answer is Galileo Galilei.

Key Points

• Galileo Galilei was the first to conclude that in vacuum all objects fall with the same acceleration g and reach the ground at the same time.
• The acceleration of the object equals the gravitational acceleration.
  • The mass, size, and shape of the object are not a factor in describing the motion of the object.
  • So all objects, regardless of size or shape, or weight, free fall with the same acceleration.
  • In a vacuum, a feather falls at the same rate as a ball.
  • The remarkable observation that all free-falling objects fall with the same acceleration was first proposed by Galileo Galilei.

Important Points

• Galileo conducted experiments using a ball on an inclined plane to determine the relationship between the time and distance traveled.
  • He found that the distance depended on the square of the time and that the velocity increased as the ball moved down the incline.
  • The relationship was the same regardless of the mass of the ball used in the experiment.
  • The experiment was successful because he was using a ball for the falling object and the friction between the ball and the plane was much smaller than the gravitational force.