Question

What is true about a car with constant velocity? (Select all that apply) A. It maintains the same speed B. It continues in the same direction C. There is a decrease in speed D. It has a negative acceleration Answer, it has a positive acceleration E. It has zero acceleration F. It has a changing direction

Answer 1

Speed stays the same.

Direction of motion stays the same.

Acceleration is zero.

Step-by-step explanation:

Velocity is a vector quantity. For two vectors to be equal, both their magnitudes and their directions need to match.

The magnitude of the velocity vector is the speed of the motion.

The direction of the velocity vector is the same as the direction of the motion.

In this question, the velocity vector stays unchanged. As a result:

• Speed (magnitude of velocity) would need to stay the same.
• Direction of motion (direction of velocity) would also need to stay unchanged.

Acceleration is the rate of change in velocity. Since velocity stay the same over time, the rate of change of velocity would need to be
`0`. Hence, acceleration would be
`0\!`.