How molecular motion related with temperature?

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

Will give brainliest! jay rides his 2.0-kg skateboard. he is moving at speed 5.8 m/s when he pushes off the board and continues to move forward in the air at 5.4 m/s. the board now goes forward at 13 m/s.a. determine jay’s mass.b. determine the change in the internal energy of the system during this process.(express your answer to two significant figures and include the appropriate units.)

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative