Math Grade 11 U
posted by Jamie .
A water balloon is catapulted into the air so that its height, h, in metres after t seconds is h=4.9t^2+25t+1.9.
when is the ball 13 m high?

put h=13, put it in standard form
ax^2+bx+c=0
and use the quadratic equation to solve for x.
Respond to this Question
Similar Questions

Math
A water balloon is shot into the air so that its height h, in metres, after t seconds is h = —4.9t^2 + 27t + 2.4 a)How high is the balloon after 1 s? 
math
A water balloon is shot into the air so that its height h, in metres, after t seconds is h = —4.9t^2 + 27t + 2.4 a)How high is the balloon after 1 s? 
math
When a soccer ball is kicked with a vertical speed of 25 m/s its height, h metres, after t seconds is given by the equation h=5t^2+25t a) how long after it is kicked is the soccer ball at a height of 30 m ? 
algebra
When a ball is thrown in the air, the height h of a ball in feet t seconds after the ball is thrown in the air, is given by the equation height = 25t–16t² Use the quadratic equation to determine how many seconds goes by before the … 
algebra
When a ball is thrown in the air, the height h of a ball in feet t seconds after the ball is thrown in the air, is given by the equation height = 25t–16t² Use the quadratic equation to determine how many seconds goes by before the … 
math HELP
When a ball is thrown in the air, the height h of a ball in feet t seconds after the ball is thrown in the air, is given by the equation height = 25t–16t² Use the quadratic equation to determine how many seconds goes by before the … 
Math
A batter hits a baseball straight up into the air. The height of the ball in metres above the ground is given by h(t)=4.9t^2+23t+2, where t is the number of seconds after the ball is hit. a) What is the average rate of change in the … 
alg 2
The path that a football takes can be described by the euation h=25t5t^2 where h is the height in meters, of the football, at t, in seconds. How high is the ball after 3 seconds? 
interoduction of aeronautical engineering
Others say that the balloon was 23 metres high and 14 metres wide. Calculate the temperature of the air in the balloon (in degrees Celsius) for this situation as well. (Assume the balloon to be spherical, and then elongated by a factor … 
math
A baseball is thrown into the air with an upward velocity of 25 ft./s. It's height in feet after T seconds can be modeled by the function h(t)=16t^2 +25t+5. how long will it take the ball to reach it's maximum height?