Abaseball is thrown home plate at 40m/s.. the batter hits the ball and sends it flying at 60 m/s in the opposite direction. if this hit only took 0.01 seconds, then the acceleration of the ball is

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?

What is the speed vfinal of the electron when it is 10.0 cm from charge 1?