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DIA [1.3K]
3 years ago
11

A train is moving in the positive direction down a track. First the train speeds up, and then it slows down. What is its acceler

ation?
A. The train has positive acceleration throughout.
B.The train has negative acceleration throughout.
C.The train first has positive acceleration and then negative acceleration.
D.The train first has negative acceleration and then positive acceleration.
Physics
2 answers:
tatuchka [14]3 years ago
8 0
C.

The train first sped up, giving it a positive acceleration in the beginning. This eliminates D since that choice states that it begins with a negative acceleration. This also eliminates B since that choice states that the train only had a negation acceleration.

Next, the train slows down, giving it a negative acceleration. We’re looking for the answer choice that starts with a positive acceleration and ends with a negative one. This makes C the correct answer. Hope this helps!
Marina86 [1]3 years ago
8 0

Answer:

The answer is <u><em>The train first has positive acceleration and then negative acceleration. </em></u>

<u><em></em></u>

Explanation: I answered the question right on my online school quiz.

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A rope is tied to a tree 4.5 feet from the ground and then run through a pulley hooked to a vehicle 33 feet from the tree. If a
Angelina_Jolie [31]

Answer:

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Explanation:

Given that,

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According to figure,

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Using Pythagorean theorem

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Using horizontal component

Vehicle displacement =horizontal component of pulled rope

Vehicle\ displacement= d\cos\theta

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Vehicle\ displacement=10\times\dfrac{33}{\sqrt{(33)^2+(4.5)^2}}

Vehicle\ displacement=9.90\ feet

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3 years ago
which statements about velocity are true? check all that apply. a. for velocity, you must have a number, a unit, and a direction
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a). for velocity, you must have a number, a unit, and a direction.
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b). the si units for velocity are miles per hour.
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When leads gets heated by a temperature ΔT energy needed = mcΔT

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Comparing both the equations

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