Using the key words from this question, namely being a “vertically projected ball”, we can formulate our own statements about this system -stating what we know before verifying the mentioned answers.

For a vertically projected ball, it is true that:

A. At it’s maximum height, vertical forces act on the ball. Gravity for example, working downwards.

B. Hence, the acceleration of the ball must be constant going downwards, as it moves at a constant gravitational acceleration of 10m/s^2.

C. As the ball shoots upwards, it must gain Gravitational Potential Energy (GPE).

D. When it shoots upwards, it must eventually slow down- meaning it loses kinetic energy.

What we can now do, is refute the question’s statements using our own.

Statement 1 must be true, as it closely matches our reasoning D and C.

Statement 2 is false, and is refuted by our reasoning B.

Statement 3 is false, as it is refuted by our reasoning A.