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

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

Which of the following has no acceleration?
a person running 100 m straight across a field at a constant speed

NOT:

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