The grape absorbs all colors except green, and green light is the
only light that remains to bounce around and enter people's eyes.
This is a big part of the reason why, whenever somebody looks at
the grape, they remark "Oh look ! The grape is green !"
During phase changes, energy changes are usually involved. For example, when solid dry ice vaporizes (physical change), carbon dioxide molecules absorb energy. Meanwhile, when liquid water becomes ice energy is released.
hope this helps :)
You didn't say what "it" is.
On a position/time graph, the slope of the graph at any point is the speed
at that time.
If you want acceleration, then what you'd have to do is to measure the slope
at every point on the position/time graph, then use that information to draw
a speed/time graph. The slope at every point on the speed/time graph is
the acceleration at that time.
