Question

A punter kicks a football upward with an initial speed of 48 feet per second. After how many seconds does the ball hit the ground?

Use the formula h = rt − 16t2 where h represents height in feet and r represents the initial speed.

Answer 1

is it three?

Answer 2

@agent0smith

Answer 3

when ball hits the ground h = 0

Answer 4

so 0?

Answer 5

solve
0 = 48t - 16t^2

t will be one root - corresponding to when the ball was kicked
Its the other root you want.

Answer 6

oh

Answer 7

factoring
t(48 - 16t) = 0

Answer 8

so t = 0 and 48 - 16t = 0

Answer 9

so its 0?

Answer 10

solve the second equation and you have the answer

Answer 11

3?

Answer 12

No - you want value of t when ball hits the ground after trvalling through the air

Answer 13

48 - 16t = 0
16t = 48
t = 3 yea

Answer 14

so wait is it or isnt it three?

Answer 15

im sorry im hella confused at this moment

Answer 16

yes it is 3

the solution to 48-16t = 0 is t = 3

Answer 17

okay thank you

Answer 18

t = 0 seconds corresponds to when the ball is kicked and after 3 seconds it lands on ground again.

Answer 19

- in both cases h = 0.

Answer 20

so wait whats the answer?

Answer 21

the question asks for the time taken to reach the ground after being kicked.

Answer 22

and that is three?

Answer 23

right

Answer 24

okay thank you

Answer 25

yw