Measurement of the H line in the spectrum of the halo star HD 19445 reveals a wavelength of 656.586 nm compared to the rest wavelength of 656.281 nm. What is the radial velocity of HD 19445 in km/s? (answer down to one decimal place and include your +/- sign; do NOT include the units in your answer

i think it’s a. this is because if they measured the mass of something with a mass of 150g, then their final answer would have to be approximately 150g. though all of their answers are almost 150, rosa and tran have the closest answers (or the exact answer) to the accurate one.

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

dang that balls went far

the answer is 12 as i may remember

: )