Question

Arianna kicks a soccer ball off the ground and into the air with an initial velocity of 42 feet per second. Assume the starting height of the ball is 0 feet. Approximately how long does it take until the soccer ball hits the ground again?

1.3 secs
2.6 secs
16.0 secs
27.6 secs

Answer 1

i cant decide between a or b

Answer 2

@jim_thompson5910

Answer 3

@agent0smith im sorry to tag you but can you help?

Answer 4

pleasse help..

Answer 5

solve \[-16t^2+42t=0\] for \(t\)

Answer 6

how do i do that?

Answer 7

factor out a \(-t\) first to get \[-t(16t-42)=0\]

Answer 8

ignore the first \(t\) because it is zero at 0 go with \[16t-42=0\]

Answer 9

so \[16t=42\] divide and you are done

Answer 10

okay so 2.6?

Answer 11

yeah seems reasonable

Answer 12

thank you!

Answer 13

yw

Answer 14

it was wrong by the way... @satellite73