Atruck at rest at a stoplight accelerates uniformly with acceleration a = 3.8 meters/second2 for 8.5 seconds after the light turns green. what is the speed of the truck in meters/second after that time interval?

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?