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vovangra [49]
1 year ago
11

As a train accelerates away from a station, it reaches a speed of 4.9 m/s in 5.4 s. if the train's acceleration remains constant

, what is its speed after an additional 5.0 s has elapsed?
Physics
1 answer:
romanna [79]1 year ago
3 0

The speed of the train after an additional 5 s has elapsed is 9.45 m/s

<h3>What is acceleration? </h3>

This is defined as the rate of change of velocity which time. It is expressed as

a = (v – u) / t

Where

  • a is the acceleration
  • v is the final velocity
  • u is the initial velocity
  • t is the time

<h3>How to determine the acceleration in 5.4 s</h3>
  • Initial velocity (u) = 0 m/s
  • Final velocity (v) = 4.9 m/s
  • Time (t) = 5.4 s
  • Acceleration (a) =?

a = (v – u) / t

a = (4.9 – 0) / 5.4

a = 4.9 / 5.4

a = 0.91 m/s²

<h3>How to determine the final velocity after 5 s</h3>
  • Initial velocity (u) = 4.9 m/s
  • Acceleration (a) = 0.91 m/s²
  • Time (t) = 5 s
  • Final velocity (v) = ?

a = (v – u) / t

0.91 = (v – 4.9) / 5

Cross multiply

v – 4.9 = 0.91 × 5

v – 4.9 = 4.55

Collect like terms

v = 4.55 + 4.9

v = 9.45 m/s

Learn more about acceleration:

brainly.com/question/491732

#SPJ1

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Newtons first law states that objects in motion stays in motion until an unbalanced force is acted upon it. what do you think th
EleoNora [17]
Hi Spycn2115


Newton's first law states that objects in motion stay in motion until an unbalanced force is acted upon it is a good fact. When I first personally heard of it in class I had no clue but when I researched it I learned that one good example of this would be those cradle balls and if u swing it, it will keep constantly hitting each other back and fourth over and over until someone grabs it and stops it, so that's what objects in motion stays in motion until an unbalanced force is acted upon it means, because the balls are in motion by moving left to right constantly and its staying in motion by not stopping and that unbalanced force is someone or something maybe hitting it or knocking it over could stop it, balanced means staying still and equal, unbalanced means unstill so moving, the cradle balls are KE and PE, (Kinect and potential energy) because kinetic means moving, so the balls are moving, and potential means stored up, so before u even swing u have the potential energy to swing it different ways before it becomes kinetic. That's one of my favorite examples of Newton's first law and I left you a pic below of cradle balls to help you get the idea.

8 0
3 years ago
At t = 15.0 seconds an object with mass 6 kg was observed to have a velocity of ‹ 9, 25, −9 › m/s. At t = 15.1 seconds its veloc
netineya [11]
<h2>Average  net force acting on the object is ‹ 540, -480, 1800 › N</h2>

Explanation:

Mass = 6 kg

Initial velocity = ‹ 9, 25, −9 › m/s

Initial time = 15.0 s

Final velocity = ‹ 18, 17, 21 › m/s

Final time = 15.1

Change in velocity = ‹ 18, 17, 21 › - ‹ 9, 25, −9 › = ‹ 9, -8, 30 › m/s

Change in time = 15.1 - 15.0 = 0.1 s

Acceleration = Change in velocity ÷ Change in time

Acceleration =  ‹ 9, -8, 30 › ÷ 0.1

Acceleration =  ‹ 90, -80, 300 › m/s²

Force = Mass x acceleration

Force = 6 x ‹ 90, -80, 300 › = ‹ 540, -480, 1800 › N

Average  net force acting on the object is ‹ 540, -480, 1800 › N

5 0
3 years ago
A heavy ball is hung from the ceiling by a steel wire. the instructor pulls the ball back and stands against the wall with the b
Maslowich
If he pushes the ball it will swing back harder hitting him in the face. if he does not push it the airs force will slow it down to where he will be out of reach of the ball.
8 0
3 years ago
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