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
Llana [10]
3 years ago
11

While skateboarding at 19 km/h, Alana throws a tennis ball at 11 km/h to her friend Oliver. If Alana is the reference frame, the

speed of the tennis ball is km/h.
Physics
2 answers:
Delvig [45]3 years ago
8 0
8 km/h I think good luck if it's wrong
dmitriy555 [2]3 years ago
6 0

the answer is 11 km/h ... i just took the test

You might be interested in
Which list accurately identifies the hierarchy of space from largest to smallest? Solar system, galaxy, planet, universe Galaxy,
Oliga [24]
<h3><u>Answer;</u></h3>

Universe, galaxy, solar system, planet, moon

<h3><u>Explanation;</u></h3>
  • <u>A galaxy</u>, such as our Milky Way Galaxy, is a collection of solar systems orbiting around a central core.
  • <u>A solar system</u> consists of a star, normally the sun and all of its planets, asteroids, comets and other bodies.
  • <u>A planet</u> is a nearly spherical body which is in orbit around the Sun. Planets are larger than moons.
  • <u>Moons</u> are typically rocky bodies which are in orbit around planets.
8 0
3 years ago
Read 2 more answers
Which element is most likely to have an oxidation number of +3?
Marina86 [1]

Answer:

A different answer to this is AI

Explanation:

4 0
2 years ago
How does the mitochondria help to maintain homeostasis for the cell?
Sergeu [11.5K]
It extracts energy from food for the cell.
6 0
2 years ago
What is the magnitude of velocity for a 2,000 kg car possessing 3,000 kg(*)m/s of momentum?
Trava [24]

The magnitude of velocity for this car is equal to 1.5 m/s.

<u>Given the following data:</u>

  • Momentum of car = 3,000 kgm/s.
  • Mass of car = 2,000 kg.

To calculate the magnitude of velocity for this car:

<h3>What is momentum?</h3>

In Science, momentum simply means a multiplication of the mass of an object and its velocity.

Mathematically, momentum is giving by the formula;

Momentum = mass \times velocity

Making velocity the subject of formula, we have:

Velocity=\frac{Momentum}{Mass}

Substituting the given parameters into the formula, we have;

Velocity=\frac{3000}{2000}

Velocity = 1.5 m/s.

Read more on momentum here: brainly.com/question/15517471

5 0
2 years ago
A car travels 100 m while decelerating to 8 m/s in 5 s.<br> a) What was its initial speed?
viktelen [127]

Answer:

Vi = 32 [m/s]

Explanation:

In order to solve this problem we must use the following the two following kinematics equations.

v_{f} =v_{i} - (a*t)\\

The negative sign of the second term of the equation means that the velocity decreases, as indicated in the problem.

where:

Vf = final velocity = 8[m/s]

Vi = initial velocity [m/s]

a = acceleration = [m/s^2]

t = time = 5 [s]

Now replacing:

8 = Vi - 5*a

Vi = (8 + 5*a)

As we can see we have two unknowns the initial velocity and the acceleration, so we must use a second kinematics equation.

v_{f}^{2} = v_{i}^{2} - (2*a*d)

where:

d = distance = 100[m]

(8^2) = (8 + 5*a)^2 - (2*a*100)

64 = (64 + 80*a + 25*a^2) - 200*a

0 = 80*a - 200*a + 25*a^2

0 = - 120*a + 25*a^2

0 = 25*a(a - 4.8)

therefore:

a = 0 or a = 4.8 [m/s^2]

We choose the value of 4.8 as the acceleration value, since the zero value would not apply.

Returning to the first equation:

8 = Vi - (4.8*5)

Vi = 32 [m/s]

6 0
3 years ago
Other questions:
  • ___________ currents in the Earth's mantle cause plate movement which causes earthquakes and volcanic activity
    7·2 answers
  • Which of the following is an organic compound?
    7·2 answers
  • What is the resultant force of the free body diagram?
    9·1 answer
  • Electrical current in a wire
    7·1 answer
  • What quantities are needed to describe the position of a water fountain relative to where you are standing? the distance and tim
    15·2 answers
  • Estefan has determined his BMI at 31. Explain how he can apply the FITT training principles to improve his body composition.
    6·1 answer
  • Mercury is in the 80th position in the periodic table. How many protons does it have?
    12·2 answers
  • Need help now due in 2 minutes
    10·1 answer
  • How does the distance traveled by the coin compare to its displacement after ten flips?
    13·1 answer
  • Why do the star constellations seem to move across the sky
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!