Question

an object can never have
a. a positive speed.
b. a negative speed.
c. a positive velocity.
d. a negative velocity.

Explanation:

Speed is a scalar quantity, meaning it only has magnitude and no direction. By definition, speed is always non - negative because it represents the rate of distance traveled over time, and distance is always non - negative. Velocity is a vector quantity, which has both magnitude and direction. So velocity can be positive or negative depending on the direction of motion. Positive speed is possible (e.g., a car moving forward has positive speed), positive velocity (when moving in the positive - defined direction) and negative velocity (when moving in the opposite of the positive - defined direction) are also possible. But speed can never be negative.

Answer:

B. a negative speed.