What is the change in potential energy if the distance separating the electron and proton is increased to 1. 0 nm?.

Since the pully is a simple machine so the mechanical advantage is a 1

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.

What are you asking