# Algebra

The following graph models the height of a model rocket in feet measured over time in seconds.

a graph of a downward opening parabola. The x axis is labeled Time in seconds. The Y axis is labeled Height in feet. Points on the graph include starting point (negative 0.04, 0) (2.5, 103), and the ending point(5.04, 0).

How many seconds does it take for the rocket to reach the ground?

Enter your answer as a number, like this: 42.
Do not round your answer if it is a decimal.

I got the answer 2.54 from subtracting 2.5 from 5.04 because the seconds it takes to reach the ground cannot be negative which is why I didn't subtract 2.5 from 5.04 which equaled: -2.54. Unless it wants us to do addition which the answer would be 7.54 seconds.

1. 👍 0
2. 👎 0
3. 👁 110
asked by Klauus
1. no. You start measuring at time t=0
It took 5.04 seconds for the height to reach zero.

1. 👍 0
2. 👎 0
posted by oobleck
2. Wouldn't it take 5.08 seconds because it started at -0.004 seconds?

1. 👍 0
2. 👎 0
posted by Klauus
3. do I need to repeat myself?
nothing happens before t=0
You launch the rocket, and 5.04 seconds later it lands.
It was launched from some initial nonzero height.
If it had been launched from the ground, it would have had to have happened 0.04 seconds earlier.

But it didn't.

1. 👍 0
2. 👎 0
posted by oobleck

## Similar Questions

1. ### Algebra

A model rocket is launched straight upward from the side of a 256-ft cliff. The initial velocity is 96 ft/sec. The height of the rocket h(t) is given by: h(t) =-16t^2+96t+256 where h(t) is measured in feet and t is the time in

asked by Lia on January 19, 2017
2. ### Math

A model rocket is launched straight upward from the side of a 212-ft cliff. The initial velocity is 86 ft/sec. The height of the rocket h(t) is given by: h(t)=-16t^2+86t+212 where h(t) is measured in feet and t is the time in

asked by amy on August 13, 2016
3. ### algebra

The question I have is to solve the problem. A model rocket is launched from the ground with an initial speed of 50 feet per second. The equation that models its height, h feet, off the ground t seconds after it was fired is

asked by Ressie on May 21, 2013
4. ### Quadratics

The path of a bottle rocket being launched into the air and falling back to the ground can be modeled by the equation s=1/2 at^2+v_o t+s_o where s is the height of the object, a is the acceleration, vo is the initial velocity, and

asked by Lost on March 20, 2019
5. ### Math

A model rocket is launched vertically upward so that its height (measured in feet) t sec after launch is given by the following. h(t) = -16t2 + 272t + 8 (a) Find the times when the rocket is at a height of 488 ft. t = sec (smaller

asked by Talbert on June 21, 2013
6. ### Math

Two kids are building a rocket for science class. once the rocket is launched its height in feet, h(t) can be found using the function h(t)=-16t^2+128t where t represents time in seconds. They record the time from the moment the

asked by May on April 17, 2014
7. ### Algebra: Quadratic Functions

A model rocket is launched with an initial velocity of 128 ft/s from a height of 70 ft. The height of the rocket, in feet, t seconds after it has been launched is given by the function s(t)=−16t^2+128t+70. Determine the time

asked by Isiah on March 18, 2014
8. ### Algebra

Use the formula h= -16t^2+250t to model the height 'h' in feet of a model rocket 't' seconds after it has luanched. Determine when the rocket will reach a height of 900 feet.

asked by Tanya on April 15, 2008
9. ### Math

A water rocket was launched from the ground, with an initial velocity of 32m/s. The rocket achieved a height of 44 m after 2 s of flight. The rocket was in the air for 6 s. Determine the quadratic functionthat models the height of

asked by Evelyn on December 27, 2016
10. ### math

a model rocket is projected straight upward from the ground level. It is fired with an initial velocity of 192 ft/s. How high is the rocket after 10 seconds? When is the rocket at a height of 432 feet? What is the maximum height

asked by Rick on April 9, 2015

More Similar Questions