You throw a baseball straight up. compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down. a. the work is positive on the way up and positive on the way down. b. the work is positive on the way up and negative on the way down. c. the work is negative on the way up and positive on the way down. d. the work is negative on the way up and on the way down because gravity is always downward.

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force