An rock is thrown downward from a platform that is 163 feet above ground at 40 feet per second. Use the projectile formula h = − 16 t 2 + v 0 t + h 0 to determine when the rock hit the ground.

The rock hits the ground at t = 4.68 seconds.

Step-by-step explanation:

The height of the rock after t seconds is given by the following equation:

In which v(0) is the initial speed and h(0) is the initial height.

An rock is thrown downward from a platform that is 163 feet above ground at 40 feet per second.

This means that

So

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

.

This polynomial has roots such that , given by the following formulas:

When the rock hits the ground?

When h(t) = 0. So

So

Then

Time is a positive measure, then:

The rock hits the ground at t = 4.68 seconds.

a) 0,0; 1,1; and 2,2

step-by-step explanation:

these have the exact same coordinates, thus they are the correct function.

hello, sorry being so rude after all that fighting i found it kind of funny, so as me saying sorry here is an answer!

since the table showed her that   2km = 2000m.

to determine, how many km in 2000m, she would divide by 1000.

= 2000 / 1000 = 2 km.

similarly, for 8000m = 8000 / 1000 = 8 km

cheers to savings

~

your pal papaguy