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
shusha [124]
3 years ago
8

Conservation of momentum

Physics
1 answer:
deff fn [24]3 years ago
5 0

Answer: 6.21 m/s opposite to Janet

Explanation:

Given

mass of Janet m_j=59\ kg

mass of Sarah m_s=32\ kg

The initial velocity of Janet u_1=7\ m/s

The final velocity of Janet after the collision is v_1=2\ m/s

the final velocity of Sarah after the collision is v_2=3\ m/s

Conserving linear momentum

\Rightarrow m_ju_1+m_su_2=m_jv_1+m_sv_2\\\Rightarrow 59\times 7+32\times u_2=59\times 2+32\times 3\\\Rightarrow 32u_2=118+96-413\\\Rightarrow u_2=\frac{-199}{32}=-6.21\ m/s

Negative indicates the direction of velocity is opposite than of Janet

You might be interested in
In a thunderstorm, the air must be ionized by a high voltage before a conducting path for a lightning bolt can be created. an el
nydimaria [60]
We know that the electric field is equal to 1 E 6 V/m

The distance between the thundercloud and the ground is 1.6km = 1600m

Electric field = Voltage/distance

This means that the breakdown voltage must be equal to

V = 1 E 6 V/m * 1600m = 1.6 E 9 V = 1.6 GV
4 0
3 years ago
A car is 200 m from a stop sign and traveling toward the sign at 40.0 m/s. At this time, the driver suddenly realizes that she m
Zinaida [17]

Answer:

4.17 m/s²

Explanation:

We are told the reaction time is 0.2 s. Now, during this reaction time the car is going to travel an additional distance of : x = u × t = 40 × 0.2 = 8 m

where u is the initial velocity of the car which is 40.0 m/s.

We are told that he had 200 m to stop before applying brakes. Thus, after applying brakes, he now has a distance to cover of; s = 200 - 8 = 192 m

Since vehicle is coming to rest acceleration would be negative, thus using Newton's equation of motion, we have;

v ² = u² - 2as

v = 0 m/s since it's coming to rest

u = 40 m/s

s = 192 m

Thus;

0² = 40² - 2(a)(192)

0² = 1600 - 384a

a = 1600/384

a = 4.17 m/s²

6 0
3 years ago
Sound is a type of _____ wave.
saul85 [17]
Sound is an example of a mechanical wave. Mechanical waves are the kinds of waves that cannot be propagated without a medium. As such, these waves cannot travel through a vacuum, just like how sound cannot travel through space, since space is a vacuum.
8 0
3 years ago
What factors affect potential energy
jok3333 [9.3K]
Mass ,gravity and height
6 0
2 years ago
Read 2 more answers
the picture shows six panels (a, b, c, d, e, and f), each displaying two snapshots of a box moving on a rough flor. forces may b
Agata [3.3K]

K = 1/2mv^2 of kinetic energy. The change in the object's kinetic energy is equal to the net work performed on it.

<h3>What causes the kinetic energy to change?</h3>

Equations. Mass and the square of the velocity are directly related to translational kinetic energy. The difference between the end and starting kinetic energies is known as change in kinetic energy.

<h3>In solar panels, is there kinetic energy?</h3>

employing semiconductor-cell-based panels. technique that uses solar thermal systems to store solar energy. This heat is used directly or transformed into concentrated solar power, or the sum of the potential energy and kinetic energy of an object or system, and electricity.

Learn more about kinetic energy here:

brainly.com/question/26472013

#SPJ4

8 0
1 year ago
Other questions:
  • By increasing the temperature, the solubility of _____.
    6·2 answers
  • Question 2 (1 point)
    8·1 answer
  • A student uses an audio oscillator of adjustable frequency to measure the depth of a water well. The student reports hearing two
    7·1 answer
  • What word describes the forces acting on the car
    15·2 answers
  • Photochemical smog consists of
    10·1 answer
  • Help ME please, I'M BENG TIMED
    5·1 answer
  • 7. Mac and Tosh are arguing about the track design. Mac claims that the car is moving fastest at point F because it is furthest
    13·1 answer
  • I will give 20 points and brainliest
    11·2 answers
  • Why are carbon atoms able to form many organic compounds?
    9·1 answer
  • For the ballistic missile aimed to achieve the maximum range of 9500 km, what is the maximum altitude reached in the trajectory
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!