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
jolli1 [7]
3 years ago
13

A train 471 m long is moving on a straight track with a speed of 75.1 km/h. The engineer applies the brakes at a crossing, and l

ater the last car passes the crossing with a speed of 15 km/h. Assuming constant acceleration, determine how long the train blocked the crossing. Disregard the width of the crossing. Answer in units of s.
Physics
1 answer:
hram777 [196]3 years ago
4 0

Answer:

t = 37.6 s

Explanation:

As we know that train is initially moving with the speed

v_i = 75.1 km/h

now we know that

v_i = 20.86 m/s

now the final speed of the train when it crossed the crossing

v_f = 15 km/h

v_f = 4.17 m/s

now we can use kinematics here

v_f^2 - v_i^2 = 2 a d

4.17^2 - 20.86^2 = 2 a(471)

a = -0.44 m/s^2

Now the time to cross that junction is given as

v_f - v_i = at

4.17 - 20.86 = a(-0.44)

t = 37.6 s

You might be interested in
Water boils to power a steam engine. Which statement best describes the changes in the water as it boils?
hammer [34]

Option B

kskmsnsnsmjsjsn

8 0
3 years ago
Read 2 more answers
Isla made ice by putting water in the freezer. Freezing is an example of (2 points)
SSSSS [86.1K]

Answer:

a physical change

6 0
3 years ago
Read 2 more answers
What does it mean for forces to be in equilibrium?.
lapo4ka [179]

Explanation:

If the size and direction of the forces on the object are exactly balanced , then there is no net force acting on the object

8 0
2 years ago
Which term defines the energy of motion?
Korvikt [17]
D kinetic energy✨
nnnnnnnnnnnnbbbhhbbbbbbb
4 0
3 years ago
The electrons equal or copy the number of _____
Westkost [7]
Protons copy the number equal
3 0
4 years ago
Read 2 more answers
Other questions:
  • WILL MARK AS BRAINLIEST!!!!!!
    11·1 answer
  • Express 79 m in units of (a) centimeters
    9·1 answer
  • You don't learn any movement concepts until high school. A. True B. False
    5·1 answer
  • The distance from Earth of the red supergiant Betelgeuse is approximately 643 light-years. If it were to explode as a supernova,
    8·1 answer
  • Which of the following is not a natural resource? a. time b. water c. land d. air Please select the best answer from the choices
    10·1 answer
  • 50 points for any help on these 3 physics problems!!!!
    5·1 answer
  • The moon has a mass of 7.34 . 1022 kg and a radius of 1.74. 10 meters. If you have a mass of 66
    15·1 answer
  • If 400 N of force was applied to a rock and it had an acceleration of 20 ms2 , what is the mass of rock?
    14·1 answer
  • Helppp meeee
    10·1 answer
  • A radar receiver indicates that a pulse return as an echo in 20 μs after it was sent. How far away is the reflecting object? (c
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!