Which is an example of negative acceleration? a snowboarder who increases speed when traveling downhill a biker who maintains a constant speed through a race a skateboarder who reduces speed when moving up a hill a runner who fluctuates speed by increasing and decreasing speed

The correct answer to the question is - A skateboarder who reduces speed when moving up a hill.

EXPLANATION:

The acceleration of a body is defined as the rate of change of velocity.

Mathematically it can be written as -

                                       acceleration a =

Here, v is the velocity of the body.

The acceleration may be positive or negative . It is dependent on the velocity of the body.

The acceleration will be considered as positive if the velocity of the body increases with time.

The acceleration will be considered as negative if the body is under an opposing force. Due to this opposing force, the velocity of the body decreases with time.

If the body moves with a constant speed along a straight line, then its acceleration will be zero.

As per the question, the acceleration will be negative in case of a skateboarder who reduces speed when moving up a hill.