Question

Medal and Fan
Need help understanding the formula

A juggler is performing her act using several balls. She throws the balls up at an initial height of 4 feet, with a speed of 15 feet per second. If the juggler doesn't catch one of the balls, about how long does it take the ball to hit the floor?

Hint: Use H(t) = −16t2 + vt + s.

7.52 seconds
1.15 seconds
0.47 second
0.22 second

Answer 1

@Hero @GIL.ojei @ali2x2 @jim_thompson5910

Answer 2

v is the initial speed and s is the initial height so the equation is
\[h(t) = -16t^2+15t+4\]
Set h(t) equal to 0 and solve for t

Answer 3

you can use the quadratic formula or completing the square

Answer 4

I got 1.15 Is that right?

Answer 5

yes

Answer 6

Thank you

Answer 7

you're welcome