SmartStudy Physics Quest 004 Solution and Payout

Can't believe it's been 21 days since I last posted a question in the quest. This post is long over due.

The question was
A glass marble falls from a height of 10 m to the ground. There is negligible air resistance, which of the following remains constant during the fall?

A) Acceleration
B) Kinetic energy
C) Speed
D) Velocity

The correct answer to the question is indeed Acceleration. All other values increase constantly. Speed and velocity have the same value (velocity is the vector quantity of speed). As it falls, the speed increases, until it gets to a maximum. Since the kinetic energy depends on the velocity, the kinetic energy is also increasing. That leaves acceleration. This is the rate at with the velocity changes with time and is constant. It depends on the pull of the earth's gravitation.

Thanks to all who participated. The first three persons all had the correct answer and so will receive an equal portion of the SBD earnings on Quest 004
@jemzem
@ijmmai
@akpomedaye

The first 3 people to give the correct answer will receive an equal share of the author rewards for this post.
You must upvote the post in order to claim your share. If you give the correct answer but fail to upvote the post, you forfeit your reward.

More about the quest
Learn some Physics and get rewarded for it by taking part in this SmartStudy Physics Quest.

I will post Physics questions regularly for the quest. There may be a link for you to read, investigate and come up with the correct answer.

To take part, upvote the post and comment the correct answer.

When the post pays out, the first 3 people with the correct answer and who also upvoted, will receive an equal share of the SBD earnings on the post.
Read more about the SmartStudy Physics Quest.