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If you drop a ball off a cliff, it starts out a 0 m/s. After 1 s, it will be traveling at about 10 m/s. If air resistance is removed, what will happen in 2 s? And how do you know this?

A. The ball will still be moving at 10 m/s.
B. The ball will accelerate to 10 m/s.
C. The ball will accelerate to about 20 m/s.

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remotecontrolbrain

Answer: (C) The ball will accelerate to about 20 m/s.

Explanation: The ball is in free fall and no other but gravitational force acts on it. This means the ball will be subject to the gravitational acceleration, which is about 9.8 m/s^2. So after one additional second the ball will increase its velocity to (10+9.8) m/s = 19.8 m/s or approx. 20 m/s.

Vannakay
This anwser is C !!!!