1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Solnce55 [7]
3 years ago
9

50 POINTS

Mathematics
1 answer:
Marina86 [1]3 years ago
6 0

vi is going in the positive direction (up). (That's my choice). a (acceleration) is going in the minus direction (down). The directions could be reversed.

Givens

vi = 160 ft/s

vf = 0 (the rocket stops at the maximum height.)

a = - 9.81 m/s

t = ????

Remark

YOu have 4 parameters between the givens and what you want to solve. Only 1 equation will relate those 4. Always always list your givens with these problems so you can pick the right equation.

Equation

a = (vf - vi)/t

Solve

- 32 = (0 - 160)/t Multiply both sides by t

-32 * t = - 160 Divide by -32

t = - 160/-32

t = 5

You will also need to solve for the height to answer part B

t = 5

vi = 160 m/s

a = - 32

d = ???

d = vi*t + 1/2 a t^2

d = 160*5 + 1/2 * - 32 * 5^2

d = 800 - 400

d = 400 feet

Part B

You are at the maximum height. vi is 0 this time because you are starting to descend.

vi = 0

a = 32 m/s^2

d = 400 feet

t = ??

formula

d = vi*t + 1/2 a t^2

400 = 0 + 1/2 * 32 * t^2

400 = 16 * t^2

400/16 = t^2

t^2 = 25

t = 5 sec

The free fall takes the same amount of time to come down as it did to go up. Sort of an amazing result.

You might be interested in
Solve lor x/5 + 6 = 10 x=​
Stolb23 [73]

Answer:

x=20

Step-by-step explanation:

8 0
3 years ago
Grace and her dad are planning to attend to State Fair. an adult ticket is $15 the price of an adult ticket is half the price of
Reil [10]

Answer:

Equation:

15=\dfrac{1}{2}x+8

Student ticket price = $14

Step-by-step explanation:

An adult ticket = $15

Let a student ticket = $x

An adult ticket is half the price of a student ticket plus $8, then an adult ticket

=\$\left(\dfrac{1}{2}x+8\right)

Equate the prices for the adult ticket:

15=\dfrac{1}{2}x+8

Subtract 8 from both sides:

15-8=\dfrac{1}{2}x+8-8\\ \\7=\dfrac{1}{2}x

Multiply this equation by 2:

7\cdot 2=x\\ \\x=\$14

6 0
3 years ago
Read 2 more answers
Does 23y+50+27y=50y+50 have one solution, no solution, or infinite solutions
stellarik [79]
The answer is infinite solutions.

subtract 50 from each side to get 
23y+27y=50y

ad 23y and 27y to get 50y
50y=50y
and no matter what number you put in place you get the correct answer
7 0
3 years ago
Read 2 more answers
What is the area of a triangle when the sides are 17, 8 and 9
sleet_krkn [62]

Answer:

ok so to solve this you need to do base x height then divide that by 2

Step-by-step explanation:

7 0
3 years ago
Kristin wants to ask the managers of the fast food restaurants in a large city “How do you retain employees?” What condition mus
Pani-rosa [81]

Answer:

d

Step-by-step explanation:

3 0
3 years ago
Other questions:
  • Which steps should you follow to write an equivalent ratio to find 120% of 700?
    15·2 answers
  • Find both unit rates.
    12·1 answer
  • A student wants to conduct an investigation to find out how much heat energy a 100-gram rock can transfer to water. He has the r
    11·1 answer
  • 30 girls and boys have planned for a picnic There is a ratio of 3 girls to 7 boys How many boys are there
    7·1 answer
  • Im horrible at math plz help
    10·2 answers
  • Two circles that have two common external tangents but no common internal tangents:
    6·1 answer
  • What type of star has an absolute brightness of 5 and a surface temperature around 3,000 °C?
    14·2 answers
  • Grant mows lawns and charges $15 per lawn. He paid his brother $45 to help him. How many lawns could Grant mow and make at least
    6·2 answers
  • What is the slope of the line that passes through the points (3, -2) and (9, -2)?
    12·1 answer
  • A scientist plans to study exotic birds in the rain forest. The helicopter
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!