A 50 kg skateboarder is riding her 5 kg skateboard at 5 m/s to the north. She jumps backwards off the skateboard at -2 m/s. What is the velocity of the skateboard after the rider jumps off?

Which of these is not a possible type of energy transformation? a. electrical energy into light energy b. sound energy into nuclear energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?

Mark creates a graphic organizer to review his notes aboutelectrical force.which labels belong in the regions marked x and y?