Ignoring air resistance, after being dropped the vertical velocity of a ball immediately before contacting a surface is dependent on: Question 18Answera.the height from which the ball was dropped and gravityb.the height from which the ball was dropped, gravity and the surface texture of the ballc.the height from which the ball was dropped, gravity, the mass of the ball, and surface texture of the balld.the height from which the ball was dropped, the mass of the ball, and surface texture of the balle.the influence of gravity, the mass of the ball and surface texture of the ball
Question
Ignoring air resistance, after being dropped the vertical velocity of a ball immediately before contacting a surface is dependent on: Question 18Answera.the height from which the ball was dropped and gravityb.the height from which the ball was dropped, gravity and the surface texture of the ballc.the height from which the ball was dropped, gravity, the mass of the ball, and surface texture of the balld.the height from which the ball was dropped, the mass of the ball, and surface texture of the balle.the influence of gravity, the mass of the ball and surface texture of the ball
Solution
The correct answer is a. The height from which the ball was dropped and gravity.
This is because, in the absence of air resistance, the only factors that affect the speed of a falling object are its initial velocity (which is zero if the object is simply dropped), the acceleration due to gravity, and the distance it falls. The surface texture of the ball and its mass do not affect its speed just before it hits the ground. This is a direct consequence of Galileo's principle of falling bodies, which states that in the absence of air resistance, all bodies at the same location above the Earth fall vertically with the same acceleration.
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