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

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

anonymous · Answer

Turns require acceleration, as velocity direction is changed. a=
v^2 / r for velocity v and radius of curvature r.

anonymous · Answer

so C.