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
andrew11 [14]
3 years ago
12

A child of mass 25 kg is skating fast, +10 m/s, and tries to get revenge by colliding with the 60 kg adult who is sitting still.

After the collision, the adult goes forward at 6 m/s. What is the child's final velocity?
Physics
1 answer:
tankabanditka [31]3 years ago
4 0

Answer: -4.4 m/s

Explanation:

This problem can be solved by the Conservation of Momentum principle, which establishes that the initial momentum p_{o} must be equal to the final momentum p_{f}:

p_{o}=p_{f} (1)

Where:

p_{o}=m_{1}V_{o}+m_{2}U_{o} (2)

p_{f}=m_{1}V_{f}+m_{2}U_{f} (3)

m_{1}=25 kg is the mass of the child

V_{o}=10 m/s is the initial velocity of the child

m_{2}=60 kg is the mass of the adult

U_{o}=0 m/s is the initial velocity of the adult (it is sitting still)

V_{f} is the final velocity of the child

U_{f}=6 m/s is the final velocity of the adult

Substituting (2) and (3) in (1):

m_{1}V_{o}+m_{2}U_{o}=m_{1}V_{f}+m_{2}U_{f} (4)

Isolating V_{f}:

V_{f}=\frac{m_{1}V_{o}-m_{2}U_{f}}{m_{1}} (5)

V_{f}=\frac{(25 kg)(10 m/s)-(60 kg)(6 m/s)}{25 kg} (6)

Finally:

V_{f}=-4.4 m/s This means the velocity of the child is in the opposite direction

You might be interested in
Gravity can be defined as a force of attraction between objects. The effects of gravity can be witnessed in many systems. Which
murzikaleks [220]
C, planets orbit around the sun because of gravity
5 0
3 years ago
What is the meaning of the reference point in electric potential?.
mrs_skeptik [129]

Answer:

<h3><u>ELECTRIC POTENTIAL</u></h3>

• the amount of work needed to move a unit charge from a reference point to a specific point against an electric field.

4 0
2 years ago
Calculate the kinetic energy of a 2kg ball moving at 5m/s
shepuryov [24]

Answer:

25

Explanation:

The kinetic energy is 25

8 0
2 years ago
An experiment to measure the speed of light uses an apparatus similar to Fizeau's. The distance between the light source and the
Marina86 [1]

Answer:

2.88*10^{8} m/s

Explanation:

The speed of light is given by

c=\frac {2d}{t} and t=\frac {\theta}{\omega} hence

c=\omega\frac {2d}{\theta}

Speed of light is given by

c=900\times 2\pi(\frac {2\times 10}{\frac {2\pi}{2*800}}})=2.88*10^{8} m/s

4 0
3 years ago
Which part is not necessary to complete a circuit
Levart [38]
A SWITCH I THINK??..

6 0
3 years ago
Read 2 more answers
Other questions:
  • What is matter made of ? Will mark as brainliest to answer
    15·2 answers
  • Vertical columns on the periodic table are called
    15·1 answer
  • Two very flat, metallic plates separated a distance d have a potential difference of 600 Volts between them as shown below. A pr
    10·1 answer
  • I could use help on this Please!! PLEASE PLEASE PLEASE!!!
    9·2 answers
  • 2. Does the amount of iron in the water affect plant growth?
    7·1 answer
  • what is the specific heat of a substance that requires 99,100J of thermal energy to heat 3.47 kg of this substance from 15 C to
    15·1 answer
  • Explain what parallel medium boundaries do to the path of the wave after it travels through both boundaries. (air and water)
    12·1 answer
  • The front end of the car is crushing and absorbing ___ which slows down the rest of the car
    9·1 answer
  • A bowling ball weighing 71.7 N is attached to the ceiling by a rope of length 3.73 m . The ball is pulled to one side and releas
    9·1 answer
  • Physics acceleration
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!