Linear Momentum and Acceleration

[XSethX]

Homework Statement

If acceleration is not equal to 0, then which of the following must not be able to stay constant?
I: Speed
II: Linear Momentum
III: Kinetic Energy

(Select any 1, 2, or all of the above, or all of the above)

Homework Equations

KE = (1/2)mv^2
P = mv

The Attempt at a Solution

I think that it's only II... I thought that speed can stay constant (for example centripetal acceleration) and kinetic energy by the same reason can stay constant...

 

[andrewkirk]

Your answer is correct.

 

[Simon Bridge]

Sounds good to me... the question is checking that you realize about vector quantities.