What is differentiation

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by

What is another way to determine mass times acceleration?