An object's acceleration increases quadratically with time: a(t)=bt^2, where b=0.041m/s^4. If the object starts from rest, how far does it travel in 7.1 seconds?

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 current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6