Question

Can someone help me on my algebra hw that has to do with the formula, h= -16t^2 +vt +s

Answer 1

what is the problem asking ?

Answer 2

I'll type the full word problem.

Answer 3

A ball is thrown upward from a height of 15 ft. with an initial upward velocity of 5 ft/s. Use the formula h = -16t^2 + vt + s to find how long it will take for the ball to hit the ground.

Answer 4

ok first step is to define each variable with the given info .

Answer 5

'h' in the formula is height
v= is the initial velocity
t= ? and
s= ?

Answer 6

t is for time ..

Answer 7

s?

Answer 8

it think 's' is intitial position

Answer 9

ok. What do i do first?

Answer 10

its asking for the amount of time it takes for the ball to hit the ground.
okay- the equation is quadratic .there fore it must be facotrable orrrr it may have to use the quadratic formula

Answer 11

Do we have to do anything with the discriminant? What would a, b, and c be?

Answer 12

okay lets see

Answer 13

I got
A=-16
B=5
C=15

Answer 14

So i have to find the discriminant now?

Answer 15

ThnX dpalnc!

Answer 16

noo. forget about the discriminant!- unless your teacher wants you to show ALL the work.

Answer 17

you can begin solving for 't'

Answer 18

How?

Answer 19

do you have the quadratic formula ?

Answer 20

Nope