Question

A racecar driver circles a racetrack with a constant speed of 110 km/hr. Which BEST describes the speed and velocity of the car? A) The speed and velocity remains constant. B) The speed is constant and velocity is changing. C) The speed has no impact on the velocity of the car. D) The velocity changes only if the car slows down or speeds up.

Answer 1

The answer is B, The speed is constant and the velocity is changing.

Answer 2

Answer:

B) The speed is constant and velocity is changing.

Explanation:

- Speed is a scalar quantity, which is equal to the ratio between the distance covered and the time taken. In this case, the speed is constant, and it is 110 km/h.

- Velocity is a vector quantity, which consists of a) a magnitude (which is the speed) and b) a direction. In this problem, the speed is constant, however the velocity is changing, because the direction of the car is changing at every moment (in fact, the track is a circle, so the direction is always changing).