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
beks73 [17]
3 years ago
13

A 5000-kg freight car runs into a 10,000-kg freight car at rest. They couple upon collision and move with a speed of 2 m/s. What

was the initial speed of the 5000-kg car?A) 4 m/sB) 5 m/sC) 6 m/sD) 8 m/sE) none of these
Physics
1 answer:
Vitek1552 [10]3 years ago
4 0

Answer:

C) 6 m/s

Explanation:

Given that

m₁=5000 kg

The initial velocity of 5000 kg car =u₁

m₂=10,000 kg

The initial velocity of 10000 kg car =u₂ = 0 m/s

After collision the final speed of the both car,v = 2 m/s

There is no any external force on the system that is why linear momentum will be conserved.

Linear momentum P = m v

m₁u₁ + m₂u₂ = (m₂ + m₁) v

5000 x u₁ + 10000 x 0 = (5000 + 10000) x 2

5000 x u₁ = 15000 x 2

5 x u₁ = 15 x 2

u₁ = 6 m/s

Therefore the answer is C.

C) 6 m/s

You might be interested in
Which of the following types of electromagnetic radiation has the lowest energy?
Fofino [41]

UV rays have the lowest energy, (highest wavelengths)

8 0
2 years ago
10. A kicked soccer ball has an initial velocity of 30 m/s at an angle of 42° above the horizontal, level
Serhud [2]

Answer:

ZAMN

Explanation:

5 0
2 years ago
What is the frequency of an event?
konstantin123 [22]

"Frequency" just means "often-ness" ... how often something happens.
It's always expressed as

        <em>(number of happenings) / (some period of time) .</em>


4 0
3 years ago
Read 2 more answers
Two children are pulling and pushing a 30.0 kg sled. The child pulling the sled is exerting a force of 12.0 N at a 45o angle. Th
irinina [24]
I'm not quite sure what happens to Fay so I didn't finish but hope it helps

5 0
3 years ago
Read 2 more answers
It is known that birds can detect the earth's magnetic field, but the mechanism of how they do this is not known. It has been su
san4es73 [151]

Answer:

EMF = 5.01 \times 10^{-4} Volts

Explanation:

Here we know that the EMF induced in this Field is given as

EMF = vBL

here B = perpendicular component of magnetic field

v = speed of the bird

L = length of the wings

now we have

B = 5\times 10^{-5} sin40

v = 13 m/s

L = 1.2 m

now we have

EMF = (13)(3.21 \times 10^{-5})(1.2)

EMF = 5.01 \times 10^{-4} Volts

8 0
3 years ago
Other questions:
  • Graylag goslings imprint on a nearby object that moves away from them during a sensitive period in the first few hours after the
    10·1 answer
  • If you wanted to estimate how much money a certain appliance costs you, how would you do it?
    11·1 answer
  • A theory is a way of explaining observations. true or false.
    8·2 answers
  • The energy an object has as a result of it being in motion is called? What kind of energy?
    7·2 answers
  • The tenancy of a moving object to continue moving in a strait line or a stationary object to remain in place is called
    13·1 answer
  • Which state of matter has a define shape and definite volume
    5·2 answers
  • The effects of repeated temperature changes within the cracks in rocks can cause ______ weathering.
    8·2 answers
  • How energy is converted from one form to other
    5·2 answers
  • 300 grams of ethanol is heated with 14640 Joules of energy to reach a final temperature of 30 °C. What was the initial temperatu
    11·2 answers
  • Cuál es el significado del diálogo intercultural​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!