Relationship between Kinetic Energy and Linear Momentum.

[AHUGEMUSHROOM]

Homework Statement

Q.1 Describe a device which can have Kinetic Energy but no linear momentum.

Q.2 Is it possible to invent a device with linear momentum and no kinetic energy.

Homework Equations

p = mv
Ek = ½ mv²

The Attempt at a Solution

For a "device" to have no linear momentum p = 0, right? But if p = 0 wouldn't Ek just = 0? So would such a "device" be impossible and the answer to Q.2 is no it is not possible.

 

[dikmikkel]

How about rotation, with angular momentum

 

[AHUGEMUSHROOM]

Like this?