A box of mass m is pushed for 10 seconds with a force P across a
horizontal floor with negligible friction. After 10 seconds,
the person stops
pushing. Sketch a velocity vs. time graph for the box.
Sketch in a dotted
vertical line at t = 10 seconds. What is different about
the motion of the
box before and after t = 10 seconds?

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?