Tuesday

July 22, 2014

July 22, 2014

Posted by **Anonymous** on Wednesday, October 10, 2007 at 3:32am.

How long is the ball in the air before it hits the ground? (The student moves her hand out of the way.)

v(final)=v(initial)+at

initial velocity is 15 and final velocity is zero. acceleration is 9.8 right.

how does height fit into this equation. isn't that necessary too.

can u please help me. i keep getting .738s as my answer

- physics please help -
**drwls**, Wednesday, October 10, 2007 at 3:53amheight (y) vs time is given by

y = 1.50 + 11 t - 4.9 t^2.

Solve for the time (t) when y = 0. You will have to solve a quadratic equation. Take the positive one of the two answers.

You don't use the velocity vs. time equation in this problem.

**Related Questions**

Physics - A student standing on the ground throws a ball straight up. The ball ...

physics - A student standing on the ground throws a ball straight up. The ball ...

Physics - A student standing on the ground throws a ball straight up. The ball ...

physics - A student standing on the ground throws a ball straight up. The ball ...

physics - Julie throws a ball to her friend Sarah. The ball leaves Julie's hand ...

Physics - A boy's hand pushes a ball through a vertical distance of 1.45 m as he...

physics - A science student is riding on a flatcar of a train traveling along a ...

physics - 5) After catching the ball, Sarah throws it back to Julie. The ball ...

Physics - A little girl is standing on a cliff and throws a ball straight down ...

Physics - A ball is tossed straight up into the air with an initial velocity of...