## Respuesta :

This is a perfect opportunity to stuff all that data into the general equation for the height of an object that has some initial height, and some initial velocity, when it is dropped into free fall.

**H(t) = (H₀) + (v₀ T) + (1/2 a T²)**

Height at any time 'T' after the drop =

(initial height) +

(initial height) +

**(initial velocity) x (T) +**

**(1/2) x (acceleration) x (T²) .**

For the balloon problem ...

-- We have both directions involved here, so we have to define them:

Upward = the positive direction

Initial height = +150 m

Initial velocity = + 3 m/s

Downward = the negative direction

Acceleration (of gravity) = -9.8 m/s²

Height when the bag hits the ground = 0 .

**H(t) = (H₀) + (v₀ T) + (1/2 a T²)**

0 = (150m) + (3m/s T) + (1/2 x -9.8 m/s² x T²)

-4.9 T² + 3T + 150 = 0

Use the quadratic equation:

T = (-1/9.8) [ -3 plus or minus √(9 + 2940) ]

= (-1/9.8) [ -3 plus or minus 54.305 ]

= (-1/9.8) [ 51.305 or -57.305 ]

T = -5.235 seconds or

**5.847 seconds**.

(The first solution means that the path of the sandbag is part of

the same path that it would have had if it were launched from the

ground 5.235 seconds

**before**it was actually dropped from balloon

while ascending.)

Concerning the maximum height ... I don't know right now any other

easy way to do that part without differentiating the big equation.

So I hope you've been introduced to a little bit of calculus.

**H(t) = (H₀) + (v₀ T) + (1/2 a T²)**

H'(t) = v₀ + a T

The extremes of 'H' (height) correspond to points where h'(t) = 0 .

Set v₀ + a T = 0

+3 - 9.8 T = 0

Add 9.8 to each side: 3 = 9.8 T

Divide each side by 9.8 : T = 0.306 second

That's the time after the drop when the bag reaches its max altitude.

Oh gosh ! I could have found that

**without**differentiating.

- The bag is released while moving

**UP**at 3 m/s .

- Gravity adds 9.8 m/s of

**downward**speed to that every second.

So the bag reaches the top of its arc, runs out of gas, and starts

falling, after

(3 / 9.8) = 0.306 second .

At the beginning of that time, it's moving up at 3 m/s.

At the end of that time, it's moving with zero vertical speed).

Average speed during that 0.306 second = (1/2) (3 + 0) = 1.5 m/s .

Distance climbed during that time = (average speed) x (time)

= (1.5 m/s) x (0.306 sec)

= 0.459 meter (hardly any at all)

But it was already up there at 150 m when it was released.

It climbs an additional 0.459 meter, topping out at

**150.459 m**,

then turns and begins to plummet earthward, where it plummets

to its ultimate final 'plop' precisely 5.847 seconds after its release.

We can only hope and pray that there's nobody standing at

Ground Zero at the instant of the plop.

I would indeed be remiss if were to neglect, in conclusion,

to express my profound gratitude for the bounty of 5 points

that I shall reap from this work. The moldy crust and tepid

cloudy water have been delicious, and will not soon be forgotten.