Free falling objects accelerate downward at a rate of approximately 10 m/s/s (or 9.8 m/s/s). As they move upward towards their highest point, they slow down. And as they fall downward from their highest position, they speed up. While the speed (and velocity) undergo these changes, the acceleration remains a constant value and is always directed downward.
 

In this question, an object is rising upward from the ground towards its highest position. It is under the sole influence of gravity so it will accelerate like any free-falling object. You must describe the changes, if any, that occur to the velocity and acceleration of the object. Here's what you need to know:

Regarding Velocity
As free-falling objects move upward, they slow down. Their speed is decreasing. Velocity is speed with a direction. So if the speed is decreasing, then the velocity is also decreasing.

Regarding Acceleration
Free-falling objects have a constant acceleration of -9.8 m/s/s (approximately -10 m/s/s.  ​Acceleration is related to changes in velocity. It is the rate of velocity change. For a free-falling object, the velocity always changes by the same amount for every 1 second of falling. For every 1 second of fall, the velocity ALWAYS changes by -10 m/s. This is always the case; it is a constant acceleration rate.