Math
posted by CeCe
An object is dropped from a balloon from a height of 500m. (a) How long does it take to reach the ground?
(b) If the object has an initial velocity of 12m/s, how long does it take to reach the ground? How far will it fall in 5 secnds?

Steve
the distance
s = 1/2 at^2
So,
500 = 4.9t^2
Now you have the time.
You need to say what the velocity's direction is. As you recall,
s = vt + 1/2 at^2
It makes a big difference whether v is positive or negative.
In 5 seconds it will fall 4.9*5^2 meters.
Respond to this Question
Similar Questions

Science ( physics )
A balloon is rising with a velocity of 4.9 m/sec releases an object from height of 96 m. a) How long after its release will the object reach the ground? 
math
the height, in feet, of a freefalling object t seconds after being dropped from an initial height s can be found using h=16t^2+s. An object is dropped from a helicopter 784 feet above the ground. How long will it take the object … 
math
The height, in feet, of a freefalling object t seconds after being dropped from an initial height s can be found using the function h = 16t2 + s. An object is dropped from a helicopter 784 feet above the ground. How long will it … 
algebra
We can determine the time it would take an object to fall (if there were no air resistance) by using the formula where d is the distance. A. How long does it take a quarter dropped from a 35 foot roof to reach the ground? 
math
The height, in feet, of a free]falling object t seconds after being dropped from an initial height s can be found using the function h = ]16t2 + s. An object is dropped from a helicopter 784 feet above the ground. How long will … 
Physics
A hot air balloon is rising at a constant velocity of 13.3 m/s. When the balloon is at a height of 15 m, a heavy object is dropped overboard. IF air resistance on the object is neglected, how long does it take for it to reach the ground? 
Math
The acceleration of an object g = 9.8 m/s^2. From the top of a building of 245 m., an object is thrown upwards at an initial velocity of 12m/s (a) What is the function for the velocity of the object? 
MATH
h=16t2+80t+96 Use this position polynomial to calculate the following: 1.The height of the object after 2 seconds 2.The height of the object after 4 seconds 3.How long the object will take to reach the ground? 
physics
An object is being thrown upward at 50m How long does it take the object to reach maximum height? 
Physics
An object is thrown upwards from a height of 50.0m at an initial speed of 19.6m/s. Determine how long will it take for the object to reach the ground.