Which category of materials does concrete belong to and why?

Which statement best describes how private industry decides where to spend the money on research and development

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

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.)