cart 1 rolling at 4 m/s hits cart 2 rolling at 2 m/s. After they hit, the first cart is only rolling at 1 m/s. Each car is 20 kg.

d. platinum would have the greatest temperature increase because it has the lowest specific heat.

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.