The formula for the height of a falling object is h = −4.9t2 + k where h is the height of the object in meters, t is the time in seconds, and k is the height, in meters, from which the object began it's fall. If a rock is dropped from a building that is 200 meters tall, what is the height of the rock 2 seconds after it was dropped?

add the table and i will answer correctly

step-by-step explanation:

b.-4 units

all you   do is count how many times you move

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4