An object travels in a circular path at constant speed. Which statement about the object is correct? A It has changing kinetic energy. B It has changing momentum. C It has constant velocity. D It is not accelerating.

1 Answer
Mar 17, 2018

B

Explanation:

kinetic energy depends on magnitude of velocity i.e 1/2 mv^2 (where, m is its mass and v is speed)

Now, if speed remains constant,kinetic energy doesn't change.

As,velocity is a vector quantity,while moving in a circular pathway,though its magnitude is fixed but direction of velocity changes,so velocity doesn't remain constant.

Now,momentum is also a vector quantity,expressed as m vec v,so momentum changes as vec v changes.

Now,as velocity is not constant,the particle must be accelerating, as a=(dv)/(dt)