An object moving with a speed or 67m/s and has kinetic energy of 500 j what is the mass of the object

In a system, when potential energy decreases, then entropy also decreases. true false

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.

What is a subatomic particle with a negative charge and very little mass?