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3 years ago

PLEASE HELP I HAVE 3 MINS LEFT FAST!!!! ILL MARK BRAINLIEST!!!

Mathematics

1 answer:

GenaCL600 [577]3 years ago

7 0

A-1500
B-1500
C-1500+1500=3000

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A rubber ball is dropped from the top of a hole. Exactly 20 seconds later, the sound of the rubber ball hitting bottom is heard.

gayaneshka [121]

9514 1404 393

Answer:

4192.9 ft

Step-by-step explanation:

We assume your falling-distance formula is supposed to be ...

s = 16t²

So, the time required to fall distance s is ...

t = √(s/16) = (1/4)√s

The time required for sound to travel distance s is ...

s = 1100t

t = s/1100

Then the sum of the time for the ball to fall and the time for the sound to travel back is ...

(1/4)√s + s/1100 = 20

275√s = 22000 -s . . . . . multiply by 1100 and subtract s

75625s = s^2 -44000s +484,000,000 . . . square both sides

s^2 -119,625s +484,000,000 = 0 . . . . put in standard form

s ≈ (1/2)(119,625 ±√12,374,140,625) = {4192.943, 115432.057}

Only the smaller of these two solutions makes any sense in this problem.

The hole is about 4192.9 feet deep.

_____

<em>Additional comment</em>

The distance equation for the falling object presumes a vacuum. The sound transmission presumes the presence of air, so the question setup is self-contradictory.

7 0

3 years ago

Round to the nearest half 6.385

iragen [17]

Answer:

6.5

Step-by-step explanation:

I hope you have a great day!!

3 0

3 years ago

Which object would have a mass of approximately 1,000 grams? A. book B. feather C. truck D. elephant

sp2606 [1]

Answer is book.................

6 0

3 years ago

Read 2 more answers

A sample of 716 adolescent girls from a particular health authority participated in a study of the relationship between systolic

Setler [38]

A lot of reading don’t you think

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2 years ago

The University of Montana ski team has seven entrants in a men's downhill ski event. The coach would like the first, second, and

VikaD [51]

Answer:

210 ways

Step-by-step explanation:

given that the University of Montana ski team has seven entrants in a men's downhill ski event.

The coach would like the first, second, and third places to go to the team members.

Since one member can get only one place and order counts here we use permutation

No of ways the seven team entrants achieve first, second, and third places

= 7P3

= $7(6)(5)\\= 210$

5 0

3 years ago