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
Aliun [14]
2 years ago
8

A ball is thrown at the ground from the top of a tall building. The speed of the ball in meters per second is v(t)=9.8t+v0, were

t denoted the number of seconds since the ball has been thrown and v0 is the initial speed of the ball. If the ball travels 25 meters during the first 2 seconds after it is thrown, what was the initial speed of the ball?
Advanced Placement (AP)
1 answer:
EleoNora [17]2 years ago
5 0

Answer:

      V_0=2.7m/s

Explanation:

The speed of the ball in meters per second is

      V(t)=9.8t+V_0

Where t denotes the number of seconds since the ball has been thrown and V_0 is the initial speed of the ball.  Then:

     V(2)=9.8(2)+V_0\\\\V(2)=19.6+V_0

If the ball travels 25 meters during the first 2 seconds after it is thrown, what was the initial speed of the ball

Also, for constant acceleration motion, the average velocity is equal to the sum of final and initial velocities divided by 2 and to the distance divided by the time:

         \dfrac{V(t)+V_0}{2}=\dfrac{d}{t}

Where you know:

  • t = 2s
  • V(2)=9.8(2)+V_0=19.6+V_0
  • d = 25m

Substituting (the units are ommited in the equationn, but added at end of the answer):

     \dfrac{V(2)+V_0}{2}=\dfrac{25}{2}

     V(2)+V_0=25

Thus, you have a system of equations:

     V(2)+V_0=25

     V(2)=19.6+V_0

Substituting the second into the first:

      19.6+V_0+V_0=25\\\\19.6+2V_0=25

      2V_0=25-19.6\\\\V_0=5.4/2\\\\V_0=2.7m/s

You might be interested in
Eo is in psychotherapy. The therapist tells Leo to recall the recurring dream he's been having and to say whatever comes to his
ANEK [815]
The therapist is using a practice known as "free association." This is where a client is asked to share thoughts freely, regardless of the coherence or appropriateness of these thoughts. This is a form of psychoanalysis that also falls into Psychodynamic Theory. 
8 0
3 years ago
Is there a such thing as dre day?
Gemiola [76]

Answer:

yes, there is!

Explanation:

hope this helps

4 0
2 years ago
Read 2 more answers
Explain an example of a Progressive reform at either the local, state, or national level in each of the following areas:
julsineya [31]

Answer:

An example of a Progressive reform at either the local, state, or national level is described below in details.

Explanation:

The principal purposes of the Progressive movement were discussing difficulties generated by urbanization, industrialization, political corruption, and immigration. The movement essentially targeted political organizations and their administrators. Reformers desired legislation to defend workers and poor people, to reform administration, and to regulate business.

6 0
3 years ago
Read 2 more answers
What percentage of the energy consumed in the United States is produced by petroleum, natural gas, and coal? A) 10% B) 30% C) 50
dolphi86 [110]
The latest reports indicate that the percentage is aprox. 67%. This rounds up to 70%

The answer is D. 
8 0
3 years ago
Read 2 more answers
Can anyone help me?<br>​
djyliett [7]

Answer:

B.

Explanation:

Because it talks about peer pressure. Harold said his friend is being chickened.

3 0
2 years ago
Other questions:
  • STATISTICS PLEASE HELP
    14·1 answer
  • The photographs depict rural and urban landscapes within the country of the Netherlands.
    7·1 answer
  • When it is 2:00 PM in Naples on January 30th what time and date is it in Sydney, Australia?
    13·1 answer
  • Your savings account pays 7 percent per year. Each 5100 in the bank grows to $107 over a one-year period. If prices increase by
    12·1 answer
  • Please if u write 1 of these essays you’ll get payed $35-40 depending on the effort❤️Needs to be in your own words
    11·1 answer
  • A person with a growth mindset believes
    11·1 answer
  • What is Ericsson’s tone? Why does Ericsson maintain this tone in the<br> Essay?
    15·2 answers
  • MAPEH - The one who answer will be brainliest <br> Please Answer now. <br> Music Thank you
    11·2 answers
  • Peter says if you subtract 14 from my number and multiply the difference by -3 the result is -30 what is peters number
    13·1 answer
  • What is the importance of learning the basic steps in a dance
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!