Which of the following is true of compasses ? A. compass magnets can be deflected by Earth's magnetic field or other permanent magnets .
B. compasses detect fluctuations in convection in the mantle.
C. compasses always point toward geographic north.
D. compass magnets can only be deflected by electromagnets such as Earth's magnetic field.​

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?