Two iron asteroids collide elastically in one dimension. The first has mass mi = 4M and
velocity v1i = +5.00 m/s. The second has
mass m2 = M and velocity v2i = -25.00 m/s.

What is the final velocity V1f of the first
asteroid and V2F of the second asteroid?
[?] m/s

Remember: right is +, left is -

answer: the correct answer for the fill in the blank is rods.

rods are the specialized photoreceptor cells that are present in the retina of human eye. they are responsible for vision in the night time ( also called scotopic vision). they have very low visual acuity and color distinguishing ability.

as they are responsible for vision in night time, therefore they are found predominantly in the nocturnal animals.