How do objects with the same charge interact? how do objects with opposite charges interact?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

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.)

Who was the first scientist to measure speed as distance over time?