You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 23.0 m below the point where the rock left your hand? ignore air resistance.

A dummy is fired vertically upward from a canon with a speed of 40 m/s. How long is the dummy in the air? What is the dummies maximum height?

v=u-at

0=40-10xt

t=4 secs

height = ut-1/2at^2

height= 40x4-1/2x10x4^2

height = 160-5x16

height=160-80=80m

d they tend to lose electrons and become cations.

explanation:

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )