The moon and the sun both affect the tides on earth. this evidence best supports the hypothesis that
a) the sun's and moon’s gravitational attraction to water is unique.
b) every object exerts gravitational force on every other object.
c) gravity is both an attractive force and a repelling force.
d) spinning objects are attracted to liquids.

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?