Question

Which of the following has no acceleration?

A.
a satellite orbiting at a constant speed

B.
a person running once around a track at a constant speed

C.
a car making a turn at a constant speed

D.
a person running 100 m straight across a field at a constant speed

Answer 1

Any time you have the object turning, you'll have acceleration. The reason why is because acceleration is change in velocity over change in time. When you change direction, you're changing velocity (since velocity has a directional component).

Answer 2

thank you @jim_thompson5910

Answer 3

no problem