# math

When a football is kicked with a vertical speed of 20m/s its height h, in meters, after t seconds is given by the equation h = -5t&2 +20t

a ) how long is the football in the air

b ) how long is it kicked is the football at a height of 15 m

How am i supposed to solve this

1. 👍 0
2. 👎 0
3. 👁 288
1. I meant h= - 5^2+20t

1. 👍 0
2. 👎 0
2. a) h = 0 when the ball lands ... 0 = -5 t^2 + 20 t ... solve for t

b) is unintelligible

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Physics

A soccer ball kicked on a level field has an initial vertical velocity component of 15 meters per second. Assuming the ball lands at the same height from which it was kicked, what is the total time the ball is in the air? [Neglect

asked by Shannon on November 14, 2012

A football is kicked with a speed of 18 m/s at an angle of 65° to the horizontal. How long is the football in the air? Neglect air resistance Would I use the equation y=y0 + voy t -1/2gt^2 ?

asked by Hannah on May 25, 2012
3. ### Physics Kinematics.

A ball is kicked with an initial velocity of 21 m/s in the horizontal direction and 16 m/s in the vertical direction. (Assume the ball is kicked from the ground.) (a) At what speed does the ball hit the ground? (b) For how long

asked by Destiny on September 28, 2015
4. ### Physics

A soccer ball is kicked with an initial horizonal velocity of 18 m/s and an initial vertical velocity of 18 m/s. 1) What is the initial speed of the ball? 2)What is the initial angle of the ball with respect to the ground? 3)What

asked by Aziz on September 29, 2011
5. ### physics

A football is kicked with a velocity of 31 m/s at an angle of 41. What is the ball's acceleration in the vertical direction as it flies through the air?

asked by rayvia on May 19, 2013
1. ### Precalculus

The quarterback of a football team releases a pass at a height of 7 feet above the playing field, and the football is caught at a height of 4 feet, 30 yards directly downfield. The pass is released at an angle of 35 degrees with

asked by Brittany on April 21, 2014
2. ### Algebra

A football is kicked from the ground and travels at a rate of 10 meters per second. The function 𝑓(𝑥)=10𝑥−5𝑥2 represents the ball's height above the ground at x seconds. Based on this function model, what is the

asked by Bubby on June 2, 2020
3. ### Algebra

The height, in meters, of a projectile can be modeled by h= -4.9t^2 + vt + s where t is the time (in seconds) the object has been in the air, v is the initial velocity (in meters per seconds) and s is the initial height (in

asked by Cooper on May 16, 2016
4. ### Physics

A football is kicked at an angle of 60 degrees above the horizontal. To make the field goal it must reach a height of at least 3.048 m above the ground. What is the minimum speed the ball can be kick in order make a field goal?

asked by cooper on June 11, 2015
5. ### Physics - 2-D kinematics

A soccer ball is kicked with an initial horizontal velocity of 20 m/s and an initial vertical velocity of 16 m/s. I've calculated: Initial Speed: 25.61 m/s Angle: 38.66 degrees Maximum Height it reaches: 13.06 m Distance kicked:

asked by Anonymous on February 3, 2012
6. ### Math

a punter kicked the football into the air with an upward velocity of 62 ft/s. its height in feet after t seconds is given by the function h = -16t^2 + 62t +2. What is the maximum height the ball reaches? How long will it take the

asked by Amy on March 8, 2015