After 2 seconds the ball will accelerate to about 20 m/s we know this because of the acceleration due to the gravity of the earth.
It is the force that causes a body to pull another body toward its center as a result of their mutual gravitational pull.
A ball falling down a cliff begins moving at zero meters per second. It will be moving at roughly 10 m/s after one second.
If air resistance is removed, the ball will accelerate to around 20 m/s after 2 seconds if the acceleration caused by the earth's gravity is 10 m/s2.
Because of the acceleration brought on by the earth's gravity, we are aware of this.
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