Ihockey puck slides across an ice rink more easily than it does across a rough concrete surface why is this

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

Lacie kicks a football from ground level at a velocity of 13.9 m/s and at an angle of 25.0° to the ground. how long will the ball be in the air before it lands? how far will the football travel before it lands?

From the perspective of an employee that effective channeling of work related information and concerns