Sam drops a rubber ball from the top of a staircase to his friend. The speed of the ball increases as it gets farther away from Sam’s hand. What is the best explanation for the increase in the speed of the ball?
1. Electric forces are acting on the ball.
2. Air resistance is accelerating the ball.
3. Magnetic forces are pushing the ball.
4. Gravitational force is pulling on the ball.

2

Answers

2014-07-11T21:42:53+08:00
4.gravititional force pulling on the ball
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2014-07-11T21:52:36+08:00
Gravitational pull is pulling the ball towards the floor.....
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