Conventional current is the rate at which positive charge flows in a circuit. In atoms, only the electrons are free to move. What can you conclude from these statements?

A) Electrons must be positively charged.
B) The definition of current must be changed.
C) Electrons do not flow in electric circuits.
D) Charges actually flow opposite the conventional current.

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?