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

@3mar could you help?

Answer 2

Of course.
That is with my pleasure!

If you are familiar with the difference between the speed and velocity:

Speed is a scalar property while velocity is a vector property (A vector is a scalar quantity with a direction attached to it).

The \(\color{red}{speed}\) of an object refers to how fast an object is moving across a distance. It can be calculated by dividing the distance traveled by the time it took to travel it. \(\color{red}{Velocity }\) includes both a speed and a direction.

Answer 3

b
if the driver "loses" the steering so to speak, they'll go off at a tangent at the point where they lost it. Bit like snipping a string on something that's being whirled around, or jumping off a funfair roundabout.
but the SIZE of the velocity aka speed is constant.
The vel is always changing in direction, but not in magnitude.